EPA-460/3-76-029
October 1976
                                ANALYSIS
                                          OF
                                 GM FUEL
                                ECONOMY
                                 SURVEYS
           U.S. ENVIRONMENTAL PROTECTION AGENCY
                Office of Air and Waste Management
            Office of Mobile Source Air Pollution Control
               Emission Control Technology Division
                  Ann Arbor, Michigan 48105

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                               EPA-460/3-76-029
         ANALYSIS
              OF
         GM FUEL
         ECONOMY
         SURVEYS
               by

         Dr. Ronald F. Janz

         Mobile Systems Group
         Aerospace Corporation
      ElSegundo, California 90245

        Contract No.  68-01-0417

    EPA Project Officer: J.D. Murrell


            Prepared for

U.S. ENVIRONMENTAL PROTECTION AGENCY
    Office of Air and Waste Management
 Office of Mobile Source Air Pollution Control
   Emission Control Technology Division
      Ann Arbor, Michigan 48105

            October 1976

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This report is issued by the Environmental Protection Agency to report
technical data of interest to a limited number of readers.  Copies are
available free of charge to Federal employees, current contractors
and grantees, and nonprofit organizations - as supplies permit - from
the Air Pollution Technical Information Center, Environmental Protec-
tion Agency, Research Triangle Park, North Carolina 27711, or from the
National Technical Information Service,  5285 Port Royal Road, Spring-
field, Virginia 22151.
This report was furnished to the Environmental Protection Agency by Aero-
space Corporation, El Segundo, California, in fulfillment of Contract No.
68-01-0417. The contents of this report are reproduced herein as received
from Aerospace Corporation. The opinions, findings, and conclusions ex-
pressed are those of the author and not necessarily those of the Environmen-
tal Protection Agency.  Mention of company or product names is not to be con-
sidered as an endorsement by the Environmental Protection Agency.
                        Publication No.  EPA-460/3-76-029
                                       11

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                               FOREWORD
         This report,  prepared by The Aerospace Corporation for the U. S.
Environmental Protection Agency, Emission Control Technology Division,
presents the results of an evaluation of seasonal, topographical, and geo-
graphical effects on fuel economy of in-use vehicles manufactured by the
General Motors Corporation.
         The results of the study are presented in five sections.   Sections 1
and 2 briefly summarize  the study results and approach.  A discussion of
the data and methods of analysis is included in Sections 3 and 4.   Section 5
presents the detailed study results.
                                    111

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                           ACKNOWLEDGMENT
         During the course of this study, Mr.  J. Dillard Murrell of the
 Environmental Protection Agency's  Emission Control Technology Division,
 who served as EPA Project Officer  for the study,  provided valuable guidance
 and assistance.  His efforts are gratefully acknowledged.
         Dr.  Ronald F. Janz was principally responsible for the analysis
 effort reported herein.  The following technical personnel  of The Aersopace
 Corporation also made valuable contributions to the analysis performed under
 this contract:
                            William M.  Smalley
                            Patricia L.  McGill
                            Esther  Lamken
                            Siumay  Cheung
                            Kenneth A.  Glaser
                            Charles J. Teenor
                            Edward V. Sakaguchi
                                              Lester Forrest,  Director
                                              Vehicle Performance Office
Approved by
Merrill G. Hinton, Group Director
Mobile Systems
   iTph/Meltzer,  GeneraVMart-Sger
          ;nt and Energy .Conservation
    vision
                                     v

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                               CONTENTS



FOREWORD	   iii

ACKNOWLEDGMENT	    v

SUMMARY	   xi

1.    INTRODUCTION	    1

2.    DATA ACQUISITION AND ANALYSIS	    3

3.    METHODS	   13

4.    RESULTS	   17

      4. 1   Carline Class Harmonic Mean Fuel
            Economy Comparisons	   *•'
      4. 2   Division and Fleet Sales Weighted Mean
            Fuel Economy Comparisons	   27

APPENDIXES

A.    LISTING OF  DATA BASE	A-1

B.    FUEL ECONOMY SCATTER PLOTS	B-1

C.    FORMULAS FOR COMPUTING FUEL ECONOMY
      AND TESTING  FOR SIGNIFICANT DIFFERENCES
      IN FUEL ECONOMY	C- 1

NOTES	N- 1

GLOSSARY	G- 1
                                    Vll

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                           FIGURES


Appendix B Fuel Economy Scatter Plots for Carline Classes Studied


   Carline Class Code 13000313	   B-5
   Carline Class Code 13000323	   B-13
   Carline Class Code 14000612	   B-21
   Carline Class Code 14000912	   B-29
   Carline Class Code 14500912	   B-37
   Carline Class Code 15250914	   B-45
   Carline Class Code 15251212	   B-53
   Carline Class Code 23000313	   B-61
   Carline Class Code 23000323	   B-69
   Carline Class Code 24000911	   B-77
   Carline Class Code 24500911	   B-85
   Carline Class Code 24501211	   B-93
   Carline Class Code 25251111	   B-101
   Carline Class Code 25251212	   B-109
   Carline Class Code 34000711	   B-117
   Carline Class Code 34501011	   B-125
   Carline Class Code 35251012	   B-133
   Carline Class Code 35501411	   B-141
   Carline Class Code 35501412	   B-149
   Carline Class Code 44500912	   B-157
   Carline Class Code 45001413	   B-165
   Carline Class Code 45251014	   B-173
   Carline Class Code 45501412	   B-181
   Carline Class Code 65501512	   B-189
                              VT.11

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                                 TABLES
2- 1.     GM Data Codes	    4

2-2.     Inertia Weight - GM Body Type Relationship
         (1975 Model Year)	    5

2-3.     Model Codes	    8

2-4.     Projected 1975 Model Year Sales Data (from EPA
         Certification Test Data Base - California and
         Federal Light Duty Vehicles)	   10

2-5.     Carline Class Identification	   11

3-1.     Carline Classes That Contain at Least 20 Cars	   15

4-1.     GM Fuel Economy Study,  Harmonic Mean Fuel
         Economy Comparisons  (N  = 5)	   18

4-2.     GM Fuel Economy Study,  Harmonic Mean Fuel
         Economy Comparisons  (N  = 10)  	   22

4-3.     GM Fuel Economy Study,  Division Sales Weighted
         Harmonic Mean Fuel Economy Comparisons	   29

4-4.     GM Fuel Economy Study,  Fleet Sales Weighted
         Harmonic Mean Fuel Economy Comparisons	   31

A 1.     GM Data Base Listing (Vehicle Data)	A-5

A-2.     GM Data Base Listing (Seasonal,  Geographical Data)  .... A-33
                                     IX

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                                SUMMARY
         Current Product Engineering, Engineering Staff, General Motors
Corporation conducted three fuel economy surveys of 1975 GM private
passenger car owners.   The objective of these surveys was  to determine what
kind of fuel economy 1975 GM customers were experiencing.  Data from this
survey for 1532 cars formed the basis for this study.  Additional seasonal,
topographical, and geographical data associated with the locations of the
owners were acquired from the literature and added to the GM data base.
Carline classes were then defined which  contained cars with the following
parameters in common: GM Division,  Inertia Weight, Engine Displacement-
Number of Carburetor Barrels (CID-BBL),  Transmission Type,  and Axle
Ratio.  Harmonic mean  fuel economies were computed for groups of cars
within each carline class.   These groups were associated with extreme  ranges
in each of eight seasonal, topographical,  and geographical parameters.  The
dependence of fuel economy on these parameters was determined by comparing
fuel economies between  groups.  Sales weighted harmonic mean fuel economies
were computed for analogous  groups at the division and fleet level.
         Preliminary results  indicate an increase in fuel economy with an
increase in average miles traveled per day for all carline classes.  It was
also found that temperature and population (i. e. , urban/highway driving
conditions) have a lesser influence on fuel economy,  but that a larger data
base is required in order to properly evaluate this result.
                                    XI

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                                 SECTION 1

                              INTRODUCTION
         The objective of this study was to analyze GM customer fuel economy
data for seasonal,  topographical, and geographical effects on fuel economy of
in-use vehicles.  Data which characterize season,  topography,  and geography
(such as temperature or elevation) were hand-transcribed from the literature
and incorporated into a GM fuel economy  survey data base.  While this
involved a substantial effort, it was justified on the basis that these data could
be used to identify fundamental relationships between fuel economy and key
parameters or combinations of parameters.
         There are many automobile design parameters which also affect fuel
economy.  Those which -were singled out for this study are as follows:  inertia
weight, engine displacement (CID),  number of carburetor barrels (BBL),
transmission type, and axle ratio.  There are other design parameters,  of
course, which also may have an effect on fuel economy such as  the number of
gears in the transmission,  whether or not the car is air-conditioned, and so
forth.  However, in this study the latter parameters were assumed to have a
secondary effect on fuel economy.
         In order to separate the effect on fuel economy of the above design
parameters from the effect of seasonal, topographical, and geographical
parameters, cars  of common inertia weight, engine displacement, number of
carburetor barrels, transmission type, and axle ratio were grouped into
classes.  Any change in fuel economy within a class was then attributed to an
effect other than a  change  in automobile design.   Harmonic mean fuel
economies were computed for subgroups of cars within individual carline
classes.  A chi-square distributed statistic was used to test the hypothesis
that the mean fuel economies for these groups were equal.  The test that was
used (Appendix C) is  asymptotic in nature and is not strictly applicable to the
small groups of cars that were analyzed in this  study.  Therefore, the results
of this study should be considered preliminary in nature.

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         A larger data base is required to substantiate these preliminary
results as well as to allow the application of multiple level hypothesis testing.
Such testing could be used to distinguish between parameters that affect fuel
economy and to determine the  relative importance of these parameters as
determinants of fuel economy.

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                                SECTION 2

                    DATA ACQUISITION AND ANALYSIS
         The GM data base supplied by the EPA Project Officer consisted of
data acquired in three separate surveys:  a 1975 Winter Survey consisting of
cars with an average initial odometer reading of 2535,  a 1975 Spring-Summer
Survey consisting of cars with an average initial odometer reading of 2600,
and a 1975 Spring-Summer Survey consisting of cars with an average initial
odometer reading of 6050.  In order to minimize differences in fuel economy
resulting from the "green car effect, " only data from the first two surveys
were used in this  analysis.  There were a total  of 1745 cars in this reduced
data set.  Some of these cars were eliminated because  of missing or erroneous
data and because it was not possible to obtain certain seasonal,  topographical,
or geographical data associated with the locations of some of the car owners.
After eliminating  these cars, there remained a total of 1532 cars for analysis.
         A partial listing of the data contained in the reduced data base is
given in Table A-1 of  Appendix A.  Axle ratio and transmission type have been
recoded for the  purposes of this  study.  The codes for Division,  Body Type,
CID-BBL, Axle Ratio, and Transmission Type are given in Table 2-1.
         A list of  the data that were added to the data base for the purposes
of this study is contained in Table A-2 of Appendix A.   The first column of
information in this table consists of inertia weights  for each car.   These
weights were  obtained from Body Type and Division  using Table 2-2.
         The "Season" parameter in the second column of Table A-2 is equal
to either "S" or "W" depending on whether the data were obtained from the
Spring-Summer Survey or the Winter  Survey. This  parameter is used  to
determine the weather parameters discussed below.
         The third column of this table contains  average miles per day
(abbreviated AMPD).  This value was obtained from the initial and final
odometer readings and the dates of the initial and  final  tank fills.

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                       Table 2- 1.   GM Data Codes
      DIVISION
BODY TYPE
CID-BBL
ODE
1
2
3
4
6








CODE
Chevrolet 1
Pontiac 2
Oldsmobile 3
Buick 4
Cadillac 5
6
7
8
9
11




Intermediate
Standard
Luxury
Fleetwood 75
Riviera, Toronado, Eldorado
Sporty (Camaro, Firebird)
Special Intermediate
Sub compact
Compact
Monza, Starfire, Skyhawk



CODE
2
3
5
6
7
8
9
10
11
12
13
14
15

140-1
140-2
231-2
250-1
260-2
262-2
350-2
350-4
400-2
400-4
454-4
455-4
500-5
      AXLE RATIO
TRANSMISSION TYPE
CODE
1
2
3
4
5

2.56
Z.73
2. 92, 2.93
3.08
3.42
CODE
1
2




Automatic
Manual



Cubic Inch Displacement - Number of Carburetor Barrels

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          Table 2-2.  Inertia Weight - GM Body Type Relationship (1975 Model Year)
GM Division Code
GM Body Type Code
1.
2.
3.
4.
5.
6.
7.
8.
9.
(Intermediate)
(Standard)
(Luxury)
(Fleetwood 75)
(Riviera, Toronado,
Eldorado)
(Camaro, Firebird)
(Special Intermed. )
(Subcompact)
(Compact)
1
(Chev)
4500
(a)
	
	
	
4000
4500
3000
4000
2
(Pontiac)
4500
(a)
	
	
	
4000
4500
3000
4000
3
(Olds)
4500
(a)
5500
	
5500
	
	
	
4000
4
(Buick)
4500
(a)
5500
	
5000
	
	
	
4000
6
(Cadillac)
	
	
5500
5500
5500
	
	
	
	
11.   (Monza, Starfire,
     Sky hawk)
3500
3500
3500
     lBody type includes a range of inertia weights; 5250 assumed for this data group.

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         The population values in the fourth column of Table A-2 correspond
 to the city in which the driver resides.  These values were obtained from the
 1976 Commercial Atlas and Marketing Guide.
         The fifth column of Table A-2 contains a code which indicates
 whether or not the city is a suburb of a larger city (the letter S indicates that
 it is  a suburb).  The actual populations of suburbs do not represent the general
 population density of the area.   Therefore, in the statistical analysis which
 was performed on these data the populations of suburbs were arbitrarily con-
 sidered to be equal  to 100,000.
         The sixth column in Table A-2 contains a terrain "index" that is
 used as a measure of local topography.  Values for this index were obtained
                                                        2
 from The National Atlas  of the United States of America.    The code that was
 used is as follows:
         Slope
         "A" - more than 80 percent of area gently sloping
         "B" - 50-80  percent of area gently sloping
         "C" - 20-50  percent of area gently sloping
         "D" - less than 20 percent of area gently sloping
         Local Relief
         "1"  - 0-100  feet
         "2"  - 100-300 feet
         "3"  - 300-500 feet
         "4"  - 500-1000  feet
         "5"  - 1000-3000 feet
         "6"  - over 3000 feet
Due to the limited number of cars available in the data base, only "Slope"
was used as  an indication of the  terrain in the analysis.
         The  elevation data (feet above sea level) in the seventh column of this
table  were obtained  from the same source as population (see above).
         The weather data in the eighth, ninth, tenth,  and eleventh columns
were  obtained from  Climatological Data,  National Summary.   Average values

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•were used for the months of December 1974 or June 1975, depending on the
value of the Season parameter discussed above.  (The assumption -was made
that these months characterized the local climate during the duration of the
Winter  and Spring-Summer surveys respectively, since the ranges in dates
between initial mailing of the surveys to  General Motors' customers and
accepting responses for these surveys •were November 1974 through February
10,  1975 and May 1,  1975 through July 31, 1975.)  The units for these quanti-
ties are as follows:  temperature — UC, relative humidity - %,  precipitation
and snow/ice - mm.   (The  last quantity was not used in this analysis. )
         The last column contains a four-digit model code.  The first digit
corresponds to General Motors.  The second digit corresponds  to a specific
                           >'s
division of General Motors.    The last two digits correspond to the  specific
model within this division.   The correspondence between  this code and  car
model is given in Table 2-3  along with Body Type.  The relationship between
the latter quantity and model was used to determine the four-digit model
designation listed for each car in Table A-2 (Appendix A).  Unfortunately,
knowledge of the  division and body type does not allow a distinction between
Vegas,  Vega Wagons, and Monzas,  for example.  (All have Body Type  8 as
indicated  in Table 2-3. ) Whenever a  situation like  this occurred, the lowest
model number was used. That is, in the above example,  all Chevrolets with
Body Type 8 were given the  code 2402 corresponding to Vegas.   This model
code was  introduced into the data base solely for the purpose of determining
total sales of cars in each carline class.  (Projected 1975 model year sales
data were provided by the EPA Project Officer by model for California and
Federal Light Duty Vehicles. )  The method which was used to determine total
sales for  a given class can  best be explained by the following example.   One
of the classes consisted of two models: 2407 and 2412.  According to Table
2-3 this class could conceivably contain the  following models:  Chevelle (Malibu,
Laguna); Chevelle Wagon; and Monte Carlo.  The total sales for this class
      code was developed in conjunction with other EPA studies.  Consequently,
 the Division Code does not correspond to the one in the GM data base (see
 Table 2-1).

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                            Table 2-3.   Model Codes
Division

Code

 2     Buirk
  3     Cadillac
 4     Chevrolet
       Oldsmobile
 o     Pontiac
Body Type
    11
     9
     9
     1
     1
     2
     3
     2
     5

     3
     5
     3
     4
                            8
                            8
                            9
                            6
                            1
                            1
                            2
                            2
    11
     9
     1
     1
     2
     3
     2
     5
                           11
                            9
                            6
                            1
                            1
                            7
                            2

                            2
                            1
                            1
                                                   Model
                  Code
01
02
03
04
05
06
07
08
09
01
02
03
04
05
01
02
03
04
05
06
07
08
09
10
11
12
01
02
03
04
05
06
07
08
01
02
03
04
05
06
07
08
09

10
11
12
Sky hawk
Apollo
Skylark
Century /Regal
Century Wgn
Le Sabre
Electra
Estate Wgn
Riviera
Seville
Calais/Devi lie
Eldorado
Fleetwood Brougham
Fleetwood 75
Chevette
Vega
Vega Wgn
Monza
Nova
Camaro
Chevelle (Malibu, Laguna)
Chevelle Wgn
Chevrolet (Caprice, Impala,
Chevrolet Wgn
Corvette
Monte Carlo
Starfire
Omega
Cutlass
Cutlass Wgn
Delta 88
Ninety-Eight
Cust. Cruiser Wgn
Toronado
Astre
Astre Safari
Sunbird
Ventura
Firebird
Lemans
Lemans Wgn
Grand Prix
Pontiac- (Bonneville, Catalina
Grandville)
Pontiac Wgn
Grand AM
Trans AM
                                                  Bel Air)

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was assumed to be equal to the sum of the  sales for these models including
both California and Federal Light Duty Vehicles.  The sales data that -were
used in this analysis  are given in Table 2-4.  As implied by this table, one
additional complication occurred with respect to the treatment of the sales
data,  that is:  some of the carline  classes  contained identical models.  For
the purpose of computing sales weighted harmonic mean fuel economy (see
Appendix C), it was therefore necessary to combine these carline classes
into single classes and associate a single sales  value (Table 2-4) with each
of the combined classes.

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Table 2-4.  Projected 1975 Model Year Sales Data (from EPA Certification
            Test Data Base —California and Federal Light Duty Vehicles)

                                       -,                  -i                -L
Number    Class I. D. a  Class Sales, %  Division Sales, %   Fleet Sales, %
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
130003131
13000323)
140006121
140009121
14500912
15250914)
152512121
23000313)
23000323)
24000911
24500911)
24501211)
25251111)
25251212)
34000711
34501011
35251012
35501411
35501412
44500912
45001413
45251014
45501412
7. 13
8.99
17.43
19-77
3.31
2.40
6.58
4.79
(c)
9-00
3. 19
2.40
0.79
5.49
0.20
4.64
3.89



53.32



17.08




15.38



14.22
                                                               100.00
  Refer to Table 2-5 for an explanation of the Class I. D.
  For those models that were represented in each carline class.
  "Data not available; zero value adopted for sales summation.
                                    10

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                          Table 2-5.   Carline Class Identification
              DIVISION-
(INERTIA WEIGHT)/10
                                              CID-BBL
-AXLE RATIO
 TRANSMISSION TYPE
                                          Example

                                          13000313

        This is a. Chevrolet •which weighs 3000 pounds, has a 140 cubic inch displacement
        engine, a 2 barrel carburetor, automatic transmission, and an axle ratio equal
        to 2.92a
         Refer to Table 2- 1.

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                                SECTION 3
                                METHODS
         The dependence of fuel economy, that is, miles per gallon (mpg)

on eight seasonal,  topographical, and geographical parameters was investi-

gated in this study.  The method utilized for establishing this dependence
involved the following steps:

         a.     Definition of a Carline Class.  Carline classes were
               initially defined  so that the dependence of fuel economy
               on seasonal, topographical, and geographical effects
               could be separated from,  the dependence of fuel
               economy on the design of the car.  Five parameters
               were used to define a carline class:  (1) Division of
               General Motors, (2) Inertia Weight,  (3) Engine-
               Carburetion Design (CID-BBL), (4) Transmission
               Type (Manual versus Automatic), and (5)  Axle
               Ratio (one of five values).

         b.     Choice of Minimum Cars per Class.  It was decided to
               consider only carline classes with at least 20 cars.
               There were three considerations that suggested this
               would be a reasonable number of cars per class:

               1.    No fewer than five  cars could be used in a  given
                    group within a carline class  to compute a
                    harmonic mean fuel economy (see Appendix C)
                    and determine statistically whether this mean
                    value was  significantly different from another
                    harmonic mean fuel economy.

               2.    A sufficient number of  cars per class would be
                    required so that two groups of cars, containing
                    at least five cars each,  could be identified in
                    such a manner that the ranges in a given parame-
                    ter associated with each group did not overlap.
                    This criteria would necessarily apply to all
                    eight parameters for each class.

               3.    As many cars as possible in the data base  would
                    be included in the study.
                                    13

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              The first two considerations clearly suggest large
              classes,  while the third consideration suggests small
              classes.  A value of 20 cars per class was chosen as
              a reasonable compromise.

        c.     Determination of Carline Classes.  A computer pro-
              gram was written which searched the data base for
              combinations of the five parameters (which define  a
              carline class) that were common to at least 20 cars.
              The results of this search are shown in Table 3-1.
              As indicated in this table, 24 classes were found that
              satisfied this criteria.  These 24 carline classes
              include 69 percent of the cars in the data base.

        d.     Determination of Carline Class Harmonic Mean Fuel
              Economies. A computer program was written that
              performs the following computations:  for each class
              of cars it determines N number of cars which are
              associated  with extreme values of each of the eight
              seasonal, topographical, and geographical parameters.
              (For example, with N=5, the program would identify
              those cars  associated with the five highest and five
              lowest values of  each parameter in each class. )  The
              program then computes harmonic mean fuel economies
              for each grouping of N cars.  Sales weighted harmonic
              mean fuel economies (see Appendix C) were not com-
              puted at a carline class level since frequently the
              same models were not present in the extreme parame-
              ter ranges.  Under these circumstances, differences
              in sales weighted fuel economies would be, at least
              partially, the result of differences in model mix rather
              than the parameter under investigation.

        e.     Determination of Division and Fleet Sales Weighted
              Harmonic Mean Fuel Economies.  Sales weighted
              harmonic mean fuel economies were computed at both
              the division'1' and fleet level.  In order to assure that
              each carline class  contained at least three cars in the
              extreme parameter ranges at the division level,  it was
              necessary to increase the number of cars in each
              extreme to  as many as 104.   A corresponding analysis
              at the fleet  level  indicated that 479 cars would be
              required  so that all 24 carline classes contained at
              least three  cars in each extreme parameter range.
This was not done for the Cadillac Division since only one carline class was
available for that division.
                                   14

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Table 3-1.  Carline Classes That Contain at Least 20 Cars
      CLASS CODE           NUMBER OF CARS

        13000313                     26
        13000323                     22
        14000612                     32
        14000912                     40
        14500912                     77
        15250914                     37
        15251212                     25
        23000313                     34
        23000323                     25
        240009H                     48
        24500911                     44
        24501211                     49
        25251111                     35
        25251212                     22
        34000711                     30
        34501011                     35
        35251012                     59
        35501411                     59
        35501412                     51
        44500912                     42
        45001413                     42
        45251014                     70
        45501412                     74
        65501512                     83
                         15

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      The sales weighted values presented should be
      interpreted with caution since there were generally
      an insufficient number of  carline classes to represent
      the divisions  adequately.

f.     Determination of the Test Statistic for Evaluating
      Differences in Fuel Economy.  It can be shown  that the
      "Test Statistic"  denoted "G" in Appendix C is distributed
      as a chi-square  with a level of confidence and 1 degree
      of freedom.   For a = 0. 95,  y2 = 3. 84146.  If  G  exceeds
      this value, the hypothesis that two harmonic mean fuel
      economies under investigation are the same is rejected
      at a 95-percent confidence level.

      Values for this  statistic were computed for each pair
      of mean fuel economies for  each of the seasonal,
      topographical, and geographical parameters for each
      carline class.
                           16

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                                SECTION 4

                                 RESULTS


4. 1      CARLINE CLASS HARMONIC MEAN FUEL ECONOMY
         COMPARISONS
         The main results of this study are displayed in Tables 4-1 and 4-2
for N=5 and N=10 respectively.  An asterisk next to the "Test Statistic" is
used to flag significant differences between mean fuel economies.  Note that
for some of these carline classes the upper bound in AMPD (average miles
per day) is quite large.   At first it was assumed that this was due  to
erroneous data that should be deleted from the data base.   However, in all
cases it was found that these large values  occurred over relatively short
periods of time, indicating long trips.  The data were therefore assumed to
be accurate.  Note also that the lower bound on population  (Range  2) is fre-
quently equal to  100,000.  This occurs because of the suburbs in the data
base that are all assigned this population.
         Comparing Table 4-1 with Table 4-2, it is evident that, while the
mean fuel economies depend  to a certain extent on the number of cars that
are used in the extreme parameter ranges, those mean fuel economies  which
differ significantly with five cars in the extreme parameter ranges generally
differ significantly with ten cars  in the extreme parameter ranges as well.
Consequently, the discussion that follows will be confined to Table 4-2.  As
indicated in this table, it was found that fuel economy increases significantly
with increasing AMPD for all 24  carline classes.  While this trend in the
data was anticipated,  it was not expected to dominate generally over other
factors that are known to affect fuel economy also.  (See discussion below.)
         Occasional differences in fuel economy with respect to  elevation,
precipitation,  relative humidity,  terrain (local slope),  and zip code were
detected. For example, consider Class 24500911 which exhibits a difference
                                     17

-------
                                            Table 4-1.   GM Fuel Economy Study
                                   Harmonic Mean Fuel Economy Comparisons (N = 5)
DATE      n776
SALES WEIGHTED
NUMBED OF CARS  IN
MUMPER OF CASS  IN
CRITICAL  VALUE  CF
                            PASAMETEF
                            Trey STAT
    CLASS

 13C JO 31 ?
          13CC0323
oo
    PAPAVt: TEP

      ZICCCCF
   POPULATION
        SLCFE
    ELEVATION
     HU"In ITY
PRECIPITATION
  TEMPEP-ATLRF
         A^FP

      7IPCOCE
   POPULATION
        SLCFE
    ELEVATICC
     HUMIDITY
PPECIFITATICN
  TEMPFSATUPF
      7IFCCCE
   POPULATION
        SLOPE
    ELEVATION
     HUMCITY
PRECIPITATION
         APPD

      ZIPCOOE
   POPULATION
        SLOPF
    ELEVATION
     HUMPITY
PP-ECIFITATICN
  TEMPEPATUPE
         AJ'PO

      ZIPCCCE
   POPULATION
        SLCFE
    ELEVATION
     HUMDIT Y
PPECIDITATICN
amt i
ANGE 2
TIC AT ...
PANGfl
2828,
1?0,
Al ,
25,
56,
9,
4.200C ,
9.32;:,
1^467,
15C,
Al,
12,
1,
0,
2.4c:c,
9.63.. C,
40 -+8,
45G,
Al,
9,
62,
9,
4. 20 CO ,
a . 2 L : o ,
11367,
161,
All
10,
54,
7,
4.2C3C,
9.35CO,
2C52,
189,
Al ,
1C,
47,
9,
5
5 SIGNIFICANCE LEVEL
RANGE2
132.5)
2132)
12)
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65)
36)
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1 3 . 4 (-. 3 u )
4391:1
6233)
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22.3U3)
11714)
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67)
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-.2000)
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7:01
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617?8,
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9:)
162)
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352CCCO)
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6CJ8)
91)
233)
                                                                                    MFAN r«PGl  MEAN  MFG2  TEST  STATISTIC
                                                                                      19.
                                                                                      13,
                                                                                      19.
                                                                                      13.
                                                                                      19.
                                                                                      17.
                                                                                      .7,
                                                                                4156
                                                                                9fc9<«
                                                                                8636
                                                                                2763
                                                                                57J6
                                                                                9449
                                                                                6793
17.0313

25.6C99
22.63J6
22.7438
23.9862
21. 5466
22.3788
19.9157
19.8463

16.8329
16.87m
14.5662
15.4822
15.4848
14.7767
13.8:84
11.9132

11.3595
14.5:82
13.2191
11.4735
12.1515
12.6C48
12.3689
                                                                                       12.5223
                                                                                       15.3241
                                                                                       12.132J
                                                                                       1J.3986
                                                                                       12.1786
                                                                                       11.9627
19.8638
2 J .4145
19.1712
17.3563
I°.9o39
19.6955
19,419J
21.8918

2J.6C4G
22.7384
22.2821
2.1. 2 149
22.48*9
21.47.9
23.5855
25.7016

16.2864
15.C7-*;
13.7546
12.4671
15.2357
16.4577
16.2499
16.6151

12.9989
11.89:4
11.9935
12.9985
11.3499
  ,8212
  ,9572
                                                                                                  13.
                                                                                                  13.
                                                                                         li».1627

                                                                                         ll.<«599
                                                                                         1J.3995
                                                                                         Il.fl32i»
                                                                                         12.C397
                                                                                         1..7127
                                                                                                 r r, 7 c
                                                                                                . w  ' -
                                                                                                .67Cc
                                                                                                .3176
                                                                                                . 3 9 L fc
                                                                                                         1 .7596
                                                                                                          . C J 3 <«
                                                                                                          .225^
                                                                                                          .0738
                                                                                                          .i:51
                                                                                                          .;<*:«
                                                                                                         1.71^(43
                                                                                                         fl.2668'

                                                                                                          . 2 K •:
                                                                                                         2.1655
                                                                                                          . 255
-------
                                 Table 4-1.   GM Fuel Economy Study
                  Harmonic Mean Fuel Economy Comparisons (N = 5)  (Continued)
1525091"+
15251212
23C00313
2300C323
24C30911
24500911
  TEMPERATURE (
         AMPO (

      ZIFCCDE
   POPULATION
        SLCFE
    ELEVATION
     HUMIDITY
PRECIPITATION
  TEMPERATURE
         AMPD

      ZIPCOCE
   POPULATION
        SLOPE
    ELEVATION
     HUFICITY
PRECIPITATION
  TEMPERATURE
         AKPD

      ZIPCODE
   POPULATION
        SLOPE
    ELEVATION
     HUMIDITY
PRECIPITATION
  TEMPERATURE
         AMPD

      ZIPCCDE
   POPULATION
        SLOPE
    ELEVATION
     HUfICITY
PRECIPITATION
  TEMPERATURE
         flMPD

      ZIPCCDE
   POPULATION
        SLCFE
    ELEVATION
     HUMIDITY
PRECIPITATION
  TEMPERATURE
         AMPD

      ZIPCCDE
   POPULATION
        SLOPE
    ELEVATION
     HUMIDITY
PRECIPITATION
  TEMPERATURE
         AMFD
t -5.1.000,
i 6. 24 w u t
42M,
2QC,
Alt
1C,
65,
3,
-4. 7COC ,
9.8130,
11*055,
ioc.
Al,
40,
64,
22,
-4.2000,
9.5700,
2158,
300,
Al,
19,
1,
0,
-3.COOO,
6.7900,
4C11,
200,
Al,
13,
It
0,
-6.9000,
10. =330,
6040,
522,
Al,
5,
49,
10,
-6.9000 ,
5.4433,
11501,
207,
Alt
5,
6 It
9,
.9COO,
9.4830,
-1.9000
12.153C)
13021)
683)
Al)
57)
68)
49)
-1.2; jo
13.1500)
17236)
903)
32)
400)
71)
39)
-.230C)
22.3900)
b877)
4061)
A2)
35)
64)
37)
6.9030)
13.2233)
33494)
floOO)
A2)
50)
56)
33)
1.10 JO)
20 . 9730)
15775)
2149)
Al)
19)
64)
29)
-1.9U-)
14.9600)
24263)
463)
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17)
73 )
37)
5.91.00)
15.3903)
26. 70QC,
72. 390C,
69030,
163;03C,
C3,
990,
S3,
156,
22.3033,
59.25CO,
70549,
1COOOO,
C5,
HOC,
32,
128,
19.9000,
13C. 8033,
91793,
53 50 CO,
C5,
1155,
80,
132,
22.30CO,
33.25QC,
93033,
174323,
C5,
900,
83,
132,
£2. 303C,
49.4200,
82931,
700030,
C5,
1539,
82,
146,
23.2000,
58.4600,
73044,
1483CO,
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1230,
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I 82.89GO,
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270.CCCC)
97411)
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97470)
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24.3000)
394.CGOO)
98273)
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2030)
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24.7003)
580. 0 Jt3)
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6748)
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27.3300)
243.0u3C)
98632)
1600000)
06)
6271)
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182)
26.4;OC)
92.3700)
98499)
560000)
C5)
3368)
83)
179)
27.3CCO
188.5000)
11.1890
1J.3265
11.8270
13.2492
11.1317
11.4914
12.3446
11.5333
11.5810
10.4928
11.7292
12.3009
11.9538
13.1065
13.4C38
12.7708
11.7580
13.7002
23.9044
20.3242
16.8742
19.5630
17.5251
17.2148
17.0305
15. 7867
26.0967
24.4340
21.8437
24.1355
23.3263
19.7324
18.2965
18.9691
12. 3306
15.6702
13.7129
13.3048
14.5370
14.5639
12.0447
9.1898
13.6769
15.3293
13.0301
10.8401
13.3753
12.9121
13.2C57
11.2853
11. 8458
14.96-43
12.1283
1-.9668
11.9114
12.7668
10.87=8
11.4684
12. 5349
12.3301
H.327C
12.2370
13. C1C1
11.6093
11.9011
13.C453
13.7097
15.2865
16.7879
16.1436
13.C971
17.3904
18.7839
18.6091
17.48CC
22.1412
19.7766
21. C464
23.7199
23.2193
18.7651
21.8052
24. 846C
24.7980
14.5639
12.65C5
14.15:5
lv.729o
13.2687
1 ?. 2334
13.3994
15.0266
12. 7563
11.3279
14.7696
15.3350
12.6834
13.4847
12.4841
15.4210
  .2957
34.9261'

  .1C26
 3.84C2
 1.5743
 3.1329
 1.9718
  .C133
 1.5253
 6.2838»

 1.48CC
  .0024
  .4628
 2.4304
 2.5335
  .3689
 1.6351
2C.6576'

12.3374*
15.6486'
  .3112
  .8622
  .9472
  .3702
  .0438
12.7366'

1C.2844'
 1.431C
  .1339
 2.6746
  .435C
  .5795
 9.3077'
 4.C625'

 3.7242
 5.5299'
  .1323
 2.0989
 4.6898'
 1.2212
 1.1554
23.6529'

  .3891
 8.5248*
 1.5734
14.6277*
  .1116
  .2165
  .4429
 8.5448*

-------
                                 Table 4-1.  CM Fuel Economy Study
                  Harmonic Mean Fuel Economy Comparisons (N = 5)  (Continued)
31.501211
25251111
25251212
34000711
34501011
35251C12
355JH.11
ZIPCC^E
POPULATION
SLOPE
ELEVATION
HUMILITY
PCtCIPITATTCN
TEMpr-ATurE
AMPC
ZIPCOCE
POPULATION
SLCFE
ELEVATION
HUMIDITY
PRECIPITATION
TEMPERATURE
AMPD
ZIPCODE
POPULATION
SLOPE
ELEVATION
HUMIDITY
PRECIPITATION
TEMFERATLRF
AHPD
ZIPCOOE
POPULATION
SLOPF
ELEVATION
HUHTITY
PRECIPITATION
TEMPERATURE
AMPD
ZIPCCCF
POPULATION
SLOPE
ELEVATION
HUMIDITY
PRECIPITATION
TEMPERATURE
AMPC
7IPCODE
POPULATION
SLOPE
ELEVATION
HUMIDITY
PRECIPITATION
TEMPERATURE
AMPD
ZIPCCDE
POPULATION
SLOPE
ELEVATION
HUMIDITY
170 It
2JG,
Al.
11,
33,
C ,
3.eojo,
11.5300,
7121,
125,
Al,
7,
65,
21,
-1.713C,
13.2000,
1940,
1212,
Al,
20,
64,
9,
-4.2000,
5.3500,
1824,
5?7,
Al,
18,
66,
15,
-3.60CG,
7.0700,
2153C,
165,
Al,
5,
33,
11,
3.90GC,
7.94JG,
1844,
110,
Al,
7,
52,
14,
-1.700G,
5.670G,
1633.
4:C,
Al,
9,
16,
153<«2)
1878)
Al)
20)
67)
41)
5.9C3:)
15. 4500)
11364)
3300)
Al)
25)
67)
82)
. 3CJO)
17.4630)
14141)
4174)
12)
44)
68)
71)
.3*30)
21.2900)
14617)
3452)
A2)
1C2)
70)
37)
5.91.00)
14.2603)
28779)
971)
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257)
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5.6JOO)
1&.363O
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All
35)
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22.4033,
113.60CO.
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65.4400,
69601,
223303,
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80,
154,
23.200C,
44.3300,
75231,
373000,
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27.1030,
54.95CC,
49779,
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106.3800.
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844431,
65,
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94553)
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27.3CC3)
127.7503)
98020)
560COO)
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85)
222)
28.1CCC)
231.25001
70072)
9250001
C5)
1600)
88)
3121
26.3300)
101.7500)
98615)
56C033)
06)
214E)
84)
183)
26.4000)
133.0000)
81501)
850000)
C5)
4596)
80)
287)
27.60uO)
72.44CC)
79701)
56LJCJ)
04)
2779)
91)
180)
27.5000)
276.5300)
99336)
3030000)
C5)
310G)
91)
11.C896
11.854;
13. 869*
11.7395
13. 395J
13.4777
12.1254
13.9549
11.3563
12.5601
11.874J
12. 3264
11. 3449
12.1275
11.2689
11.5852
10.7513
11.4683
11.3766
13.5422
13.9408
12.4667
13.6825
9.767G
14.9213
15.9473
14.1536
14.0345
14.1649
14.4355
13.7303
12.3139
14.0492
14.9229
12.9581
12.5364
14.2611
13. QC 55
13.2832
13.2726
14.1294
14.5963
13.7221
13.4046
12.5948
14.3625
11.6726
11.4701
13.4617
13.9703
11.6949
13.9335
1 1 . 4 '. 5 j
11.C657
12.52U
12.57b4
12.8537
11.6223
12.1312
12.6447
14. -.525
13.4596
10.2454
9.8164
12.;249
11.9998
12.1138
13.5.67
1 3.8983
12.3278
10.3905
i:.s:47
11.7375
11.5316
11.2C43
12.447C
12. 7991
14.3762
12.91oO
14.3598
14.7841
14.I564
14.4t.57
13.9943
16.3375
1-..9141
14.7799
12.9873
i '* . 7 ; „ 3
12.9499
14.C777
14.4C69
14.9389
13.6975
13.62^4
12.5491
13.3462
12.1822
13.8C80
14.11.2
14.9270
11.5150
13.7767
11.6979
11.4b36
12.2899
                                                                                                    1 .4^)18
                                                                                                     .7798
                                                                                                    1.914J
                                                                                                    1.3C4«
                                                                                                    1
  .
 7.CS96
  .3312
19.417C*

 3.444C
                                                                                                    4.11C4"
                                                                                                     .0927
                                                                                                     .4657
                                                                                                     . 3 : : c
                                                                                                    o.2«u2»
                                                                                                   1 7 . : 0 1 8 •
  .9392
  .2222
 1.4:5:
  .5132
 2.8555
 2.71C3
13.6185'

  .1573
12.277:»
  .0146
  .8726
  .0:37
    C** ^ c
    . o t
  .0636
13.1852'

 3.9>«64»
  .0320
  .0005
 5.6176'
  .8408
  .5072
 2.2569
 3.6839
  .5853
  .6794
  .C827
  .0045
  .4141
 1.182?
 9.2455'
16.0766'
                                                                                                   15.9801'
                                                                                                     .coc:
                                                                                                     .077J
                                                                                                     .93M

-------
                                 Table 4-1.   GM Fuel Economy Study
                  Harmonic Mean Fuel  Economy Comparisons (N = 5)  (Concluded)
.55531412
4453G 912
45C 31417
45251C14
455C1412
65501512
PRECIPITATION (
TEMPERATURE <
ACFC t
7IPCOCE (
POPULATION (
j L CF E (
ELEVATION (
HUMICITY (
PRECIPITATION (
TEM PE9 A TUC F (
AMFC (
ZIPCCCE t
POPULATION (
SLCPF (
ELEVATION <
HUM CITY (
PRECIPITATION (
T EM PE - A TU1* F (
A"PD (
7IPCODE (
POPULATION (
SLOPE (
ELEVATION (
HUMOITY (
PRECIPITATION (
TEMFERATURr (
AfP? (
7IPCCCE (
POPULATION (
SLOPE (
ELEVATION (
HUMIDITY (
PRECIPITATION (
TEMPERATURE (
AMFD (
ZIPCCCE (
POPULATION (
SLOPE (
ELEVATION (
HUMIDITY (
PRECIPITATION (
TEMPERATURE (
APFO (
ZIPCCCE (
POPULATION (
SLOPE (
ELEVATION (
HUP I n IT Y (
PFECIDf TAT ION (
TEMPERATURE (
AMFC (
f
-1.900G
1 ?. 1800
11545
120
Al
20
54
3
- 4 . 7u 0 C
5 . 7 3 0 0
150 1
336
Al
6
62
53
-2.=c,:
3. 130C
18 ' 1
145
Al
7
44
4
-.8CGC
11.24::
11758
250
Al
20
53
0
-4. 2COC
8. 480,0
197C
14G
Al
5
16
0
-8.1000
12.5100
194C
6CC
Al
1C
39
C
-1.9000
5.0430
3C )
-.7033)
14 . 3. C 0 )
1  0 )
A2)
160)
7 '-j )
41 )
- . 7 L 0 0 )
23.4200)
14226)
65C)
Al)
203)
72)
46)
-2.0:3:)
11.24::)
6450)
1C33)
Al)
24)
65)
3)
-1 .7330 )
16.7930)
7712)
1600)
Al)
25)
51)
1)
-.4C03)
11 .860 3)
153,
27.23CO,
92. 22::,
75220,
54.325,
C3,
1176,
83,
146,
23.1333,
131.3330,
55139,
925330,
84,
937,
77,
163,
22.43.3,
57.7530,
78332,
222333,
C4,
1230,
32,
152,
21. 60.3,
70.89::,
.7,8&2°»

"''" S3!
1097,
ee.
152,
25. 70:0,
134. 17CC,
85252,
85oOCC,
C4,
1253,
34,
179,
26. CO 30 ,
132.8333,
94386,
2750333,
C5,
2726,
83,
182,
26. 7000,
84. 2900,
239)
30.3000)
147.830:)
81625)
3444C1)
Ci)
6186
91
16C
2 7 . 2 3 Q j
4bl .5000
770C7)
8 r 8 '" " 0 " )
~C4)
1700)
85)
2C3)
26.7C33)
112.200C)
99233)
75801JO)
04)
2216)
88)
192)
26.7303)
163.6:3.)
92335)
3000020)
06)
4061)
91)
189)
27.2000)
314.5COC)
94702)
33 0 GOuO )
05)
3 3 0 : )
88)
312)
30 . 320G)
432. C jCO)
95825)
8 3 3 C o 0 0 )
04)
4498)
88)
192)
28.6003)
742.C30C)
11.3837
13.2836
11.6428
13.8232
12.9182
9.6«79
10.2928
11.1289
11. 7685
1 2 . : 4 8 1
9.7392
12 . 4244
13.2751
12.1147
11.2962
11.5164
13.1703
12.3096
13.2613
13.4333
13 . 8547
12. 4197
11.4641
9. 3737
10.4751
13.7225
9.6365
9.5235
11.9252
12.3262
12.8949
11 . 8263
11. 7918
11.7314
9.0610
11.0318
11.4789
13.4895
I'O. C:34
12.6733
11 .6882
11.2559
9.0181
13.3809
11.5849
11.1129
13 .8296
13.9149
13.3556
13.9527
3.7383
1 ^. 1160
12.0237
14. 1.341
11 .5458
i:.235o
9.9427
11.2647
12.2433
13. 3419
i: . 3476
14. 3875
12. 7254
11.4320
10. 76.0
11.9960
11.4746
11. -967
1 i. 3427
1 ?.6297
9.8165
12. 544C
13 . 6183
9.9249
11.1.199
13.8133
12.3815
13. 2084
13.8677
11.3092
12. J02C
13.9197
9. 8343
11. 2552
13.8111
14. 8064
11.6882
9.3082
9.8972
11. 7353
13.8242
9.7726
11.9.o2
12. 7623
11. us;
1 j . 3444
i:.4,33
1 ; .6623
12. 412;
13.2291
11 . .414
12.4j78
 1.G556
 3.C30-6
 7.0102'

  .2406
18.3188'
  .03C5
  .3653
  .5796
 1.2437
 2.6251
4C .9741*

  .0582
 2.7897
  .5023
  .1742
  .o:c =
 1.6335
  .8331
 3.1799
 6.4622'
 1.3146
 2.6636
  .i;i =
 5.8324*
ol .4315*

 1.1564
  .241:
  .lie;
 3.3797
 2.2958
  .2871
 1.0234
24.3634'

  .3177
 4.1978*
  .375C
 6.3419*
 6.7738*
 2.6623
  .35C9
29.1816*

  .5651
 1.1743
  .4418
  .3239
 4.2688*
                                                                                                     .0387
                                                                                                  36.2664*

-------
                                           Table 4-2.  GM Fuel Economy Study
                                 Harmonic Mean Fuel Economy Comparisons (N =  10)
         D A T t      ", i : 7 e,
         SALES  KEISHT^C
         NUMBED CF  CA-:
         CRITICAL  VALUE
                      ]Tt  sflM^F  1
             N PACflKETEP  -ANGt  ?
             P T^ST STATISTIC AT
                                                1 ;
                                                                LFVEL
                                                                             3.841.46
             CLASS
                                         RANGE
          13COC 323
tSJ
          14.JC bl2
• o:c 912
ZIPCCCF
POPULATION
SLOFF
t Lcl/ATICK
HU"IOITY
P R E C T P I T A T I C N
TEMPERATURE
flNFC
7.IPCCDE
POPULATION
SLOPE
r LtVATICN
H'JMflT Y
PCECI PITATICN
TEMFC ft ATIJF.F
Af PIT
7 TofcrE
POPULATION
SLOPE
ELKV A TICK
HUPICIT Y
P-ECICITATICN
TEMPF.CATURF
ANPD
7IPCOGE
POPUL A T 1C h
SLCFf
ELEVATION

PRECIPITATION
1>r'MF~RA7U£-F
A*PD
ZIPCCCE
PO°ULATICN
^ L C F E
ELEVATICN

PRECIPITATION
2828,
12C,
Al,
25,
56,
9,
-4.2000,
9 . :2 J C ,
14467,
is:,
Al,
12,
1,

- ? . 4 c ; c ',
9.63 Jt,
4C48 ,
4 5 L ,
Al,
9,

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-4.2CCC,
8 . 2 C : L ,
11367,
lt>* ,
Al,
1C ,

7J
-4. 2C 0 t ,
9.35CO ,
2C52,
189,
Al ,
i:,
47,
9,
481 : 5 i
1 3 1 J u )
T2 )
25; )
7 j )
56)
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3C . it ;:»
77546)
3553.)
33)
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70)

9 . 2 : 3 n )
5 b .:::•. i
1 8 7 j 4 )
19. j " )
A2)
4 J6)
72)
82)
1.7000)
?. ; . 2 1 j j i
19151)
1 2 9 G '"• )
A2)
326)
70)
61)
-.3:u:>
15.9200)
15219)
95b)
A2)
173)
b8)
43)
7282:,
i : •. o c c ,

66u!
76,
97,
1 9 . 5 ] : i, ,
37.53:0,
146Q 1,
5 4 0 j C ,
•36,
1133,
72,
65,
13. 2::o,
42.42:0,
49:79,
1 ] " C J ^ »
93,
762,

118,'
20.63GO,
33.433Q,
5C521,
"^ "3 1 7 L O •
i3'

81,
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12. b30u,
3b. 890C,
76G31,
5; :occ,
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222)
28. IOC 0)
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162)
27.5:::i
107.8300)
998C2)
352CjCO)
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6IG8)
91)
203)
23.1532
19.4737
11. 8957
13.5269
1 9 . u 4 2 b
18 . 051C
19. 3855
16.692C
22.9769
22.6739
22.5172
2 1 . 9 1 4 -j
22.4327
21 .2.25
21.2-30
19.63u2
15. g894
15.6:63
15.4l4l
16.114,
15.5927
13.8158
12. 8285
13.2894
11. 35^9
14.4235
13.1313
12.0. SI
12.1936
12. 4536
12. 3752
10.975U
11.3C78
1^.1579
1 2 . G fc 0 2
11 . 5985
11.7871
12.1239
18.5535
19.5621
1 8. 55 33
1 c . . L J 1
n..7<:,3
2 j . 1558
I?. 6875
21.6.70
21. 362^
2 2 . 1 1 c' 4
21.8891
L ? . 2 9 '-K
2 2 . o 1 ^5
2 3 . 1 e 99
2 * . .. c f 1
2 -j . .' 5 <: 3
15. 8953
15.5334
14. o 7 92
1 ^ . f . = 9 9
14. 4537
15.84^7
16. 291J
16.624 J
15. 1126
11.6*26
12.4771
12.7749
12. 42 38
13.8534
14. C149
1 3.9519
11.8539
1 j . 5 L L.' 4
12.8169
12. 2344
11.4526
13. 1186
                                                                                                 STATISTIC

                                                                                                    1 . 8 * 5 t
                                                                                                     . u: v 7
                                                                                                     .C "4t

                                                                                                     .Jit*1
                                                                                                    2.787«
                                                                                                     .2311.
                                                                                                    1 .0491
                                                                                                     . : 8 i 7
                                                                                                     .1-15
                                                                                                       '
                                                                                                    i . : *j 7 '
                                                                                                    1.0194
                                                                                                   17.5517'

                                                                                                     .5K8
                                                                                                     .L . 34
                                                                                                     .-*77?
                                                                                                    5 . * " 1 : •
                                                                                                    i . i '. o e
                                                                                                    ? .643 '
                                                                                                   14.65BC*
                                                                                                               1 1 . b : 9 4 •
                                                                                                                 .4936
                                                                                                                 . 9 P 6 c,
                                                                                                                 .C59:
                                                                                                                2.5374
                                                                                                                3.1075
                                                                                                               19.326!'

                                                                                                                 . c ; 2 3
                                                                                                               31.277."
                                                                                                                 .6:9*
                                                                                                                 .318?
                                                                                                                 .08b4
                                                                                                                1.2,72

-------
                                          Table 4-2.  GM  Fuel Economy Study
                          Harmonic Mean  Fuel Economy Comparisons (N = 10) (Continued)
         1525091'+
         15251212
         23-00 313
ro
OJ
         230JC323
         240Q..911
         24503911
•j-pf.' (IT; Af U=E
ACFC
7IPCODF
POPULATION
SLOPE
ELEVATION
HUMIDITY
PRECIPITATION
TEMPERATURE
AWPD
ZICCO~E
POPULATION
SLOPE
ELEVATION
HUMC ITY
PRECIPITATION
TEMPERATURE
APPO
ZIPCODE
POPULATION
SLCFE
ELEVATION
HUMILITY
PRECIPITATION'
TEMPERATURE
AMPC
ZIPCODE
POPULATION
SLCFE
ELEVATION
HUMIDITY
PRECIPITATION
TEMP^ATUFE
AfFC
ZIPCOCE
POPULATION
SLOPE
ELEVAT ION
HUMIDITY
PRECIPITATION
TEMPE^ATL'-E
AMPO
ZIPCOCE
POPULATION
SLCFE
ELEV-ATICN
HU f I H IT Y
PRECIPITATION
TFMFESATUkE
A1PD
-5.40 ::,
0.24C.,,
4231,
2 ' C ,
Al,
10,
65,
3,
-4.70C C,
9.8130,
IMI 55,
100,
Al,
4G,
64,
22,
-4. 2GOC ,
9.5700,
2158,
3.0,
Al,
19,
1,
C,
-3.0GoO,
6.7900,
4011,
200,
Al,
13,
It
0,
— 6. 9000,

60*0 ,
522,
Al,
5,
49,
1C,
-6.9000,
5.440 0,
11501,
207,
Al,
5,
61,
9,
.9COO,
9.4800,
-.9:00) (
12.9-u-) (
25312) (
3:30) (
A2) (
^30) (
72) (
6C) (
-.4300) (
17.3900) (
37C76) (
342 3 ) (
92) (
591) (
74) (
90) (
1.93 Jo) (
35.3800) (
3 0 3 1 J ) (
Ij036) (
32) f
287) (
66) (
60) (
13.2j33) (
17.8300) (
52402) (
790 3C) (
32) (
282) (
63) (
57) (
1 5 .'""-) (
26. i,,J,j ) (
21061) (
7000) (
Al) (
57) (
67) f
44) (
4.2-30) (
18.383:) (
29607) (
15211 (
Al) (
57) (
71) (
64) t
8 . 9 0 0 0 ) (
2J . 3000 ) (
24. 1003,
56. 180 j,
6 j438,
1.0000,
02,
757,
62,
117,
21.80CO,
33. 39CO,
50034,
37608,
C2,
870,
77,
112,
6.233C,
49. 220G,
99139,
110642,
C4,
744,
74,
118,
20.6030,
33.5030,
90731,

83^
694,
75,
65,
18.13GC,
38.8100,
73651,
1 6 0 0 C 0 ,
95,
895,
80,
117,
21.90CC,
4 5 . 2 9 0 C ,
53095,
100000,
63,
1 3 C 0 ,
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2 „ . 6 Q 0 '0 ,
64.2200,
27.50CC)
270.0.00)
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222)
28.1,1;:)
151.2500)
97470)
36GOuO)
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1450)
85)
197)
24.3000)
394. GOOD)
98273)
352COOO)
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2 J 3 0 )
87)
165)
24.7300)
58 3. COO 0)
98148)
730000)
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6748)
87)
192)
27.3000)
243. 0700)
98632)
1600000)
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6271)
87)
182)
26.4000)
92.370C)
96499)
56COOOI
05)
3368)
83)
179)
27.33U)
188.5000)
11.3515
13.3721
11.4969
12.6634
11.8748
11. 7148
11. 7314
11.9538
11.7822
11.4454
11.9294
12.2675
12.0949
12.4773
12. 6638
11.542:
12.0132
11.2472
19.2497
20 .2486
17.4517
18.4884
18.3732
17.4595
16.9098
16.5895
24.2318
22.4398
21. 2114
22.7516
21.0902
19.7528
19.0755
19.7532
12.1645
14.7725
12.7239
13.2772
14.1143
12.6549
10.8059
13.9246
13.4C20
14.6284
12.2674
11.4668
12.9339
12.4635
13.7605
11.3577
12.4053

11 . bcP2
11 1 5121
11. 9331
12.6772
11 . 6338
12. 0158
12. 0 154
12.9547
12.4-26
12.1112
12. 7456
12.5618
11. 5321
13.1451
13.5518
1 3. 5323
18.^872
15. 7851
18.5229
17. C887
18.4937
19.3982
19.2287
2:. 8372
23. 3083
21. 2016
21. 8093
21. 7862
23.8187
23. 1533
24 . 1892
23. 3419
14.1920
12.7404.
13. 5161
I4.24bl
11 .4867
13.2184
13.7507
15.2366
12.7548
11.4343
14.0782
14.9055
12.6966
12.74-+6
13.4198
15. 3G42
 1.6601
23.4513*

  .1.936
 2.5614
  .3:8*
 2.5165
  .0174
  .0128
  .1684
 5.1259*

  .3294
  .027:
  .5791
  .OG79
 1.74CC
 2.8971
 3.6649
 6.3346*

 1.0214
24.7:06*
  .6868
 1.1970
  .0128
 1.7253
 1.2380
16.0464*

11.5727*
  .4473
  .120C
  .2930
  .026C
 4 . 0 !• 4 C *
16.4937*
 5.1578*

 4.9849*
 5.6126*
  .7861
 1.8397
 4.4732»
  .1192
 7.7142*
15.3325*

  .3059
13.944!"
 6.2296*
15 .979"*
  . 0464
  .3785
  .2556
17.5253*

-------
                                 Table 4-2.  CM Fuel Economy Study
                  Harmonic Mean Fuel Economy Comparisons (N =  10) (Continued)
il4r, ,1211
35251111
25251 212
     711
345ui;il
    1Cl2
355ul41
zicccTr. <
FCPiJLlTICt (
SLOP? (
F Lr VATIC N (
H'JPlrITV (
P^CTTTA! TCN
TCM°"ATUCF (
Afc~ t
7 ID^nr c
POPULATION t
SLOPE (
F L C V A T I C t (
HIJMICTT Y
PCECI PIT ATTCC (
TfcMFr^AIUKF (
APPD
7IFCCCE (
POPULATION (
SLQFr (
ELEVATION (
HUCKITY (
PSECJPITATICN
TEMFESflTUCF (
A^IPD (
ZTPCCCE (
POPULATION (
3LCFF (
EL~V4TICN (
HUMC'ITY (
PSECIPITATICN (
TEHPFKATURF (
ftMPD (
ZIPC03F (
POPULATION I
SLOPE t
ELEVATION (
HUMIDITY (
PfiECIPTT4TICN (
TEMPS -flTURE
AMPD t
ZIPCCDE (
POPULATION
SLOFF
ELEVATION
HUKirlTY
PRECIPITATION
TEMP- SATU-F
ft KPC
7IPCCCC
POPULATION
SLCFE
ELEVATION
HUM PITY
17.1,
2-C,
41,
11,
33,
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3 . p ; 3 : ,
1 1 ,}3 j L ,
7i.21,
125,
41,
7,
65,
21,
— 1 . 7G 3 0 ,
13.C81C,
194C ,
1212,
41,
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64,
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5. 38CO,
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527,
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18,
66,
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2l5Tw,
165,
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33,
11,
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231.25j:>
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11.9973
11.7233
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11.37J1
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11-3518
11. 5242
13.9963
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14.6629
14.8717
14.3779
14.6679
13.8866
15.22«»7
14.8163
12.8549
13.2899
14.6642
14.3924
13.5^74
14.3498
13.4C97
12.8556
12.4979
13.9JG4
14.1252
13.6483
13.2375
13.1479
13.7246
11.7827
11.8826
11.4106
13.5293
11.3206
11.3663
11.8771
12. •IS-^J
12. '•-'37
12.1647
1 2. u2-.8
11 . o: 'js
1 ? . H , 7 .
1 2 . 34-45
1 •* . 1 t '-> H
!Z.d539
11. 19C6
13.S5B2
1 i . 2 1 2 5
12 . /u42
1?, 7924
12. 8^.3
13.6331
11.85.3
lj.79^4
11. 1876
11.6379
11. 63rt4
11.2575
11.8915
12.5554
14.3521
13.9185
14. 1757
14.1401,
14.9218
14. Iu55
14.5327
15.7993
lH.5737
13.8546
13.2228
14. 5927
15.9289
14. 3536
It. SDL 3
14.86J3
13.2866
13.94^5
12.9833
12.8231
1214364
13:7480
14. 1233
14. 8867
12. 3789
11.5615
12. 1414
12. 2i.l4
12.8737
  .4!. 1

 3 '. 2 A 3 4
  .: ° 7 7
  .a::?
27.9391'

 3.C ?16^

 l!237?

 2 ! 0 1 C 3

Il!oi52»
11.83C9'

 2.3717
 1.7*28
  .5536
  .7351
  .1943
  .1153
 1 .7611
13.2681'

  . u 9 7 :
 1 . 1 3 5 ?

  !3:65
  .93.4
 1.4478
  .0937
 4 . 4476'
 1.5381
 1.3259
  .6664
  .2162
  .6386
13 .6592'
19.5236'

  .9876
  .w595
 1.0369
  .3132
  .7343
  .332?
19 .5 5 C f-. '
28.8691'

  .4112
 7.4384»
  .7211
  .6123
 2.33C I

-------
                                          Table 4-2.  GM Fuel Economy Study
                           Harmonic Mean Fuel Economy Comparisons (N = 10) (Concluded)
                  PRECIPITATION
         35531*12
                     POPULATION
                          SLCPE
                      ELEVAT ION
                       HU"ICITY
                  PRECIPITATION
         **500912
         *5 GO li*l 3
CSJ
         AMPD

      ZIPCCCE
   POPULATION
        SLOPE
    E LEV AT ICN
     HUMIDITY
PRECIPITATION
  TEMPERATURE
         AMPO

      7IPCCCF
   POPULATION
        SLCFE
    ELEVATION
     HUMIDITY
PRECIPITATION
  TEMPERATURE
         *5251Ci*
         *55jl*l2
         65501512
      ZIPCODE
   FCPULATICN
        SLOPE
    ELEVATION
     HUMCITY
PRECIPITATION
  TEMPERATURE
        • AMPC

      ZIPCOCE
   POPULATION
        SLCFE
    ELEVATION
     HUMIDITY
PRECIPITATION
  TEMPERATURE
         AMPO

      ZIPCCCE
   POPULATION
        SLOPE
    t LEVATICN
     HUP IDTTY
PRECIPITATION
  TEMPERATURE
         AKFO

( -1.
( 13.
( 1
(
(
(
{
(
( -*.
( 5 .
(
(
(
(
(
(
( -2.
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(
(
(
(
(
(
( — .
( 11.
( 1
(
(
(
(
(
< - * .
( 8.
(
(
(
(
(
(
( — 8 .
( 12.
(
(
{
(
(
(
< -1.
( 5.
0,
9CC.,
18C C ,
15*5,
120,
Al,
20,
5*,
3 ,
7C.O,
733C,
153 1 ,
336,
Al,
6,
62,
53,
9000,
130'3,
18-1,
1*5,
Al,
7,
**,
*,
30.0 ,
2*3C,
1753,
250,
Al,
20,
53,
u ,
2C 0 C ,
* 8 . „ ,
197C,
1*0,
Al,
5,
16,
C,
100 0 ,
5100,
19*C ,
60 u ,
Al,
10,
39,
C ,
9030,
3*30 ,
5 j ) (
i.g^jO) (
23 . .833 ) (
37223) (
<«235) (
A2) (
553) (
70) (
*2) (
-1.2. 30) (
17.1833) (
76*2) t
7673) (
A2) (
53) (
68) (
132) (
3. 8:333) (
17.3133) (
?8ol3) (
13533) (
A2) (
'39) (
72) t
73) (
.3703) (
22.9233) (
38917) (
3530) (
A2) (
* 2 C ) (
75) (
*9) t
-1.9333) (
13.353 j) (
121*8) (
37*7) {
Al) (
*2) (
63) (
37) (
— . * L j 3 ) (
20.1*33) (
15137) (
3573) <
Al) (
35) (
06) (
5) (
. 5 " u 3 ) (
15.3*J3> (
1*5,
25. 93.3,
35. 3830 ,
67*01,
3330.0,
^3,
1311,
82,
112,

6 3 . 3 0 C 3 ,
*3""<5,
1 3 3 3 3 C ,
q 3 ,
690,
76,

2 1 . 3 0 1 0 \
38.6733,
68536,
13COOO,
63,
1335,
31,
123,
11. 803C,
*&.!!. 3,
61731,
5*3325,
B2,
83C,
? 5,
1*6,
22.3DC3,
59. 8630,
71375,
131711,
8*.
385,
es,
12*,
23.*033,
7*. 1103,
91803,
85300C,
C3,
920,
82,
1 C t t
2*. 0000,
65. 0000,
239)
30.3^03)
1*7. 830.1)
81625)
8***tl)
05)
6186)
91)
163)
2 7 . 2 . 0 >3 )
*61.5 303)
773C7)
838303k.)
C*)
170.)
85)
203)
26.7CCO)
112.2330)
992j8)
758300)
C*)
2216)
88)
192)
26.7300)
163.63 JL)
92335)
30CCCGO)
06)
*C61)
91)
189)
27.2303)
31*. 5000)
9*732)
3000000)
C5)
3800)
88)
312)
3C.3.CO)
*32.0COO)
95825)
8080003)
0*)
**98)
83)
192)
28.6000)
7*2.C30C)
11.9G26
12.51 83
ll.*979
1 3 . * 'J 1 *
13.3673
13. 6i.32
13 .8961
11 . 0861
11.9257
11.6b73
lj.6360
11.6913
13. 3s3*
11.5*27
ll.*851
13.9855
11.7577
11.29*3
13.18*9
13 .7875
10.9357
11 . 1122
11.1*35
13.*LC2
10 .6*26
13.51C5
9.833C
11. 3C08
11.2837
11. 8629
11.9883
11.9335
11.2318
11.8826
9.5269
13.75o6
ll.**79
13.2718
13.*5*9
12.6531
11.0968
13.9362
9.3925
10.7238
ll.*632
11.0C55
11.02*1
10.*997
13. 7**6
11.679*
3.9908
13.1320
12. 1819
1*. 3**5
12. .357
11. 11*5
11. 3515
13.9129
11 . 6*86
11. 1359
11.2591
13.527*
12. 5159
ll.**35
11.321,6
12. 56*1
11. *235
13.9383
12.2*93
13.5961
13.9771
11.3562
13 .6178
ivl .6157
13.6665
10 .9022
12.2379
1?.5633
13 .9*98
11. 8389
11.3837
11.25C3
9.9363
ll.*352
11 .b*61
13.8320
11.9*26
9.8*51
10.8227
11.63C2
i: . litci
13. 1328
11. 81.8
12.7579
11.2272
13. 8166
11.1387
11. 3350
11.7710
1'3. 5*5*
11. 3266
12.*756
 1.365*
  .1906
18.3*23*

 2.0772
 8.5:i:»
  .*271
  .0002
  .*153
 1 .Cl**
  . * 3 6 9
1* ,8**9*

  .*7C5
 3.9923*
  .3**9
 1.2:16
  .1523
  .*325
  .7575
18.675:*

  .C36C
  .*157
  .5257
  .5217
  .1907
  .1257
 8.1765*
H7.3966*

  .2323
  .*923
  .9
-------
due to terrain.  For locations in which more than 80 percent of the area is
gently sloping (Slope = A),  fuel economy for this class was found to be
significantly less than for locations in which less than 80 percent of the area
is gently  sloping (Slope ranges from B to D).   This  example illustrates one
of the reasons it was  decided to generate scatter plots of individual car fuel
economy versus values of each of the eight parameters under investigation
for each carline class.  Such plots not only illustrate trends,  but can  also be
used  to explain  anomalous results.  Such a plot for  fuel economy versus the
terrain index (Slope) for  carline Class 24500911 is given in Appendix B
(along with all of the other scatter plots).  Note  that the correlation coeffi-
cient for these data is equal to 0. 1825.  However,  since the 95-percent
confidence interval for this coefficient (refer to  the figure) contains zero,
the correlation  is not significant.  That is, while examining extremes in  the
data may  result in significant  differences in mean fuel economy, the data
itself do not  exhibit any significant trend.
         The only carline class that did not exhibit a significant correlation
coefficient with respect to AMPD was  Class 23000313 (see Appendix B).
Note, however, that this was due to a  single car where fuel economy was
unusually low for  the  relatively high miles per day traveled.
        A detailed analysis was not made of significant differences in fuel
economy with respect to  those parameters (such as elevation) that occurred
infrequently.  It was noted, however,  that in all four carline classes in
which fuel economy increased significantly with  increasing zip code,  the
mean value for  average miles  per day traveled by those drivers located in
high zip code areas was substantially higher than the mean value for average
miles per day traveled by drivers located in low zip code  areas.
        Next to AMPD,  differences in mean fuel economy with respect to
population occurred most frequently (nine carline classes, refer to
Table 4-2).  In  all nine cases, fuel economy in densely populated areas was
found to be significantly less than fuel economy in sparsely populated  areas.
In four of  these  carline classes,  the data exhibited a significant negative
                                    26

-------
 correlation (Appendix B), confirming the tests for differences between fuel
 economies in extreme population ranges.  However, in all but two of the
 nine classes, it was also found that the mean value for AMPD in the densely
 populated areas was substantially less than in the  sparsely populated areas.
 In the remaining two classes, the mean value for AMPD was actually
 greater in the heavily populated areas.  Both AMPD and urban versus high-
 way driving conditions associated with the population density of  the area in
 which the car was  driven have an effect on fuel  economy. In order to  deter-
 mine whether population effects related to driving conditions are affecting
 the fuel economy of the  carline classes in this study, a larger data base is
 required that would provide a sufficient number of cars per class so that
 two-way statistical tests could be performed.
         Next to population, differences  in mean fuel economy with respect
 to temperature  occurred most frequently (seven carline  classes, refer to
 Table 4-2).  In  all seven cases, fuel economy in a warm climate was found
 to be significantly  greater than fuel economy in a cool climate.  In all seven
 carline classes, the data exhibited a significant positive correlation
 (Appendix B), confirming the  tests for differences between fuel  economies
 in extreme temperature  ranges.   Again, however, AMPD was consistently
 higher in the warm climate  areas.  In four cases,  the difference in AMPD
 could easily account for the increased fuel economy.  A larger data base is
 required to determine whether it is temperature or AMPD that is the domi-
 nant factor influencing fuel economy for  these carline classes.   It would not
 be surprising to find an increase in fuel  economy in a warm climate because
 of the  reduction in  time  intervals associated with engine  warmup.
 4.2     DIVISION  AND FLEET  SALES WEIGHTED MEAN FUEL
        ECONOMY COMPARISONS
        Division and fleet  sales weighted harmonic mean fuel economies
 are listed in  Tables 4-3 and 4-4.  These values were computed using the
formulas of Appendix C.  The trends, of course,  are the same as those
                                    27

-------
exhibited by the carline classes.  That is, fuel economy apparently increases
with increasing average miles per day and temperature, and decreases with
increasing population.  As indicated in Section 4. 1, however, further
analysis is required before it can be concluded that temperature and  popula-
tion are influencing the fuel economy of th.ese carline classes rather  than
average miles  per day.
                                    28

-------
                                        Table 4-3.  GM Fuel Economy Study
                       Division  Sales Weighted Harmonic Mean Fuel Economy Comparisons
         DATE     S1676
         SALES MEISHTEO
        YES
         NUMBER OF CARS IN PARAMETER RANGL  1
         NUMBER OF CARS IN PARAMETER RANGE  2
                             100
                             100
          DIVISION
                 1
    PARAMETER
      ZIPCOOE
   POPULATION
        SLOPE
    ELEVATION
     HUMIDITY
PRECIPITATION
  TEMPERATURE
         AMPO
 SWMPG1
12.8968
13.8469
12.9469
13.1508
13.2248
12.7795
12. 3412
11. 79 62
 SHMPG2
13.1448
12.6206
12.9966
13.2294
12.7368
13.5126
14.0209
14.2534
RANGE 1
2052,
100,
Al,
9,
h
-5.4000,
6.2400,
402G1)
16500 )
B2I
544)
73)
72)
4.)
24.)
RANGE 2
53213, 99SG2)
100000, 3520030)
32, 06)
745, 73001
76, 91)
103, 222)
16.4000, 29.10CO)
35.3G&J, 608.0000)
         NUMBER  OF CARS  IN  PARAMETER RANGE 1
         NUMBER  OF CARS  IN  PARAMETER RANGE 2
                             96
                             96
tsj
vO
DIVISION
PARAMETER
ZIPCOOE
POPULATION
SLOPE
ELEVATION
HUMIDITY
PRECIPITATION
TEMPERATURE
AMPO
SWMPG1
13.0954
14.0723
13.2171
13.1569
13.2902
13.4553
12. 8403
12.2477
                                                    SWMPG2
                                                   13.8334
                                                   12.7273
                                                   13.3896
                                                   13.5151
                                                   13.3400
                                                   13.5028
                                                   13.8642
                                                   14.6989
RANGE 1
( 1701,
( 125,
Al,
i5:
0,
-6.9000,
5.3800,
32653 )
20800)
A2)
287)
72)
74)
13.)
26.)
RANGE
48221,
100000,
82,
690,
76,
103,
19.8COG,
36.6730,
2
98632)
3520000)
06)
67-48)
88)
312)
28. 1070)
580.0000)
         NUMBER  OF CARS  IN  PARAMETER RANGE 1
         NUMBER  CF CARS  IN  PARAMETER RANGE 2
                              80
                              80
           CIVISICN
                  3
    PARAMETER
      ZIPCOOE
   POPULATION
        SLOPE
    ELEVATION
     HUMIDITY
PRECIPITATION
  TEMPERATURE
         AMPO
 SHMPG1
12.9482
1^.0249
13.5157
12.6785
13.2898
13.2018
12.5193
12.0319
 SHMPG2
14.1830
13.0969
12.9768
13.3728
13.4654
13.2221
14.0356
14.4567
RANGE 1
1603,
110,
Al,
if;
0,
-4. 7000,
5.6700,
27&2)
20003)
B2)
406)
71)
72)
5.)
24.)
RANGE
48197,
100000,
( 82,
720,
76,
115,
20.9030.
42.3900,
99336)
80830CO)
06)
6186)
91)
297)
30. 3000)
461.5000)

-------
                               Table 4-3.   GM Fuel Economy Study
        Division Sales Weighted Harmonic Mean Fuel Economy Comparisons (Continued)
mm
&

                                   m
DIVISION
              7.IPCODE
           POPULATION
                SLOPE
            ELEVATION
             HUMIDITT
         PRECIPITATION
           TEMPERATURE
                 AMPO
                SHMPG1
               11.10 n
               11.5752
               11.2656
               11.0898
               11.6737
               11.7359
               1 3 . 92 89
               10.U17
                                        SHMPG2
                                       11.6126
                                       11.0902
                                       11.3878
                                       11.7510
                                       10.8396
                                       11.3^9^
                                       11.6385
                                       12.5228
RANGE 1
1501,
InO.
Al.
5,
16,
0,
-8. 1000,
8. 1300,
U530<»>
52500)
595)
76)
60)
28 I I
RANGc
«»8Q55,
100000,
82,
620,
78,
102,
(,.9000,
32.2100,
2
99238)
8380000)
06)
i*061)
91)
312)
30.3003)
<«32.i)OC3)

-------
                                Table 4-4.  GM Fuel Economy Study
                Fleet Sales Weighted Harmonic Mean  Fuel Economy Comparisons
OflTt     31676
SALES HEI3HTED    YES
NUMBER Cf CARS IN PAR.AMcT^R  RANGE 1   480
NUMBER OF CAiiS IN PARAMETER  RANGE 2   480
    FLEET     PARAMETER     SHMPG1
        1       ZIPCODE    12.617&
             POPULATION    13.4052
                   SLOPE    12.8449
              ELEVATION    12.8233
               HUMIDITY    13.0696
          PRECIPITATION    12.7942
            TEMPERATURE    12.2497
                    AMPO    11.89K*
 SWHPG2
13.191+2
12.<»336
12.9609
13.0280
12.58^6
12.9284
13.5669
14.0325
RANGE 1
1501,
100,
Al,
5,
S;
8. 1000,
£.0400,
H30C8)
52500)
82)
590)
74)
82)
8.)
29.)
RANG£
47371,
100000,
82,
620,
75,
101,
15. 9000,
33.3903,
99802)
30800001
06)
7330)
91)
312)
30. 3003)
742. 00 :0)

-------
      APPENDIX A
LISTING OF DATA BASE
           A-l

-------
                               APPENDIX A

                         LISTING OF DATA BASE
         This appendix contains two tables.  Included in Table A-i is a
partial listing of the original GM data supplied by the EPA Project Officer
for each car that -was used in this study.  The seasonal, topographical, and
geographical data that were either computed directly from data in Table A-l
or acquired from the literature are  included in  Table A-2.
                                    A-3

-------
                              Table A.-1.  GM Data Base Listing (Vehicle Data)
        IS ION
         MPG
        BODY TYPE  C1D-3:1L   AXlc  RATIO
                                             CITY
                                                  STATE
                                               ZIP
 1
 2
 3
 4
 '3
 6
 7
 3
 9
iu
11
12
13
14
15
16
17
18
19
20
•21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39

H
42
43
44
45
46
47
48
49
4.
4.
3.
4.
4.
2.
6.
4.
4.
4,
4.
1.
3.
4.
4.
4.
1.
2.
4.
3.
4.
4.
4.
4.
4.
4.
3.
3.
1.
2.
2.
1.
4.
3.
4.
4.
6.
4.
3.
2.
3.
3 .
4.
4.
3.
4.
1.
1 1 . 
-------
 Dl
 52
 53
 56
 57
 5*
 59
 60
 ol
 62
 fai
 64
 65
 66
 67
 68
 63
 7J
 71
 72
 73
 74
 75
 76
 77
 7=5
 79
 80
 81
 82
 83
 8t
 85
 36
 87
 88
 89
 90
 91
 92
 93
 9*
 95
 96
 97
 98
 99
iog
101
102
103
104
105
106
•J
 *
J.
*•.
1
. •
1.
 1 .
 3.
 4.
3.
3.
«!-.
4.
4.
4.
3.
1.
?.
4.
3.
2.
1.
2.
2.
3.
4.
1.
3.
3.
3.
4.
3.
4.

I:
4.
1.
2.
4.
2.
1.
3.
1C . 2 I
11 . ,'c
14.7'.
13. 2-,
1 1 I J C
11.3-
 V.: -
14. 4t
2 C . o 1
11. 7c
14.4i.
13.vt>
15. >.
13.1-
1 ^ . J -
14. 9«t
11 . 3 •»
11. wC
       It . 7<«
        9.18
       It . -t
       1C. 7j
       1 i . 1 -»
       1<». ji
       11 . 7t
       1 i.. ^ T
       1C. j. 0
       13. 71
       lc.1^
       12.3c
       11.d3
       12.62
       12.89
       11.07
        9.73
       12.97
       1*.3<»
       ll.il
        6.9^
       12.6C
       1C.87
       11.99
       11.16
       16.35
        9.3*.
       11.02
       12.21
        9.76
        9.^5
        8.06
                   1.
                   3.
                  11.
                  t .
                  2.
                  >> .
                  3.
                  2.
                  t .
                  1 .
                  2.
                  5 .
                  ^ .
                  1.
           1.
           i .
           3 .
           2.
           2.
           2.
           I.
           3.
           2.
           2.
           2.
           2.
           2.
           3.
           2.
           3.
           5.
           2.
           2.
           2.
           2.
           5.
           1.
           9.
           2.
           2.
           1.
           2.
           7.
           9.
                                     6.
                                     y .
                     5 .
                    11.
                     9.
                     3.
                    10.
                     v.
                    15.
                             9.
                            11.
                             9.
15.
1C.
 9.
 9.
10.
 9.
14.
12.
 9.
12.
11.
10.
14.
 9.
14.
 4.
 0.
 0.
: 4.
 0.
..4.
 9.
 5.
12.
11.
 9.
12.
 9.
 9.
i .
1.
2.
2.
2.
3.
2.
2.
1.
1.
1 .
4.
3.
2.
4.
2.
2.
1.
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1*76
1*77
1*79
1*79
1*80
1*82
1*83
1*8*
1*35
1*87
1*88
1*89
1*90
1*92
1*93
1*9*
1*95
1*96
1*97
1*98
1*99
1500
1501
1502
1503
150*
1505
1506
1507
1508
1509
i510
1511
1512
1513
151*
1515
1516
1517
1518
1519
1520
j.521
1522
1523
152*
1525
1526
1527
1528
1529
1530
1531
1532
*.
3.
t.
*.
2.
2,
1.
1.
1.
1.
3.
1.
3.
1.
2.
1.
1.
2.
1.
11
1,
1,
1,
1,
1.
1,
1.
1.
2.
1.

li
1.
1.
1.
1.
1.
1.
1.
1.
2,
1.
1.
2.
1.
1.
1.
1.
1.
1.
1,
1.
1.
1.
1.
1.
1.
1.
2.
1.
1.
1,
1.
1,
1,
1,
1,
1,
1.
2,
1,
1,
1,
1,
2,
1,
1,
LJS
L3S
 "
    ANGELES
    ASGELES
                                                          HAWTHORNE
                                                          REOON90 KFACH
SAN PEDRO
M'DNTROSE
NORTHRIOGE
CANITD^ CNTRY
S.HERMAN OAKS
CMIND
ALHAM3RA
CARLS3AD
SAN DIEGO
SAN DIEGO
PALM SPRINGS
CGLTON
FONT ANA
Q/UVIcW
0 X N A R 0
QXNARD
PORTERVILLE
TULARE
BAKERSFIELD
OID3ECREST
ORANGE COVE
FRESNO
SALINAS
ATHERTON
SUNNYVALE
MARTINEZ
BERKELEY
BERKELEY
LOS GATOS
SANTA CLARA
SANTA CLARA
SAN JOSE
SAN JOSE
SAN JOSE
SAN J3SE
TWAIN HARTE
CITRUS HTS
SACRAMENTO
GLADSTONE
CORNELIUS
OAKRIDGE
KLAMATH FALLS
MOUNTLAKE TER
SEATTLE
W,OUNT VERNON
TAC 3^A
OLYMPIA
LDNGVIEW
E rtENATCHEE
SPOKANE
KENNE^ICK
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CT
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
3*
OR
OR
OR
WA
WA
VIA
WA
WA
WA
WA
WA
WA
WA
9J068
90220
90250
93277
9^278
90732
91020
9132*
91351
91*23
9171C
913C3
92008
92126
9213*
92262
9232*
92335
93322
93J30
93D30
93257
9327*
9330*
93555
936*6
93727
93901
9*025
9t08b
9*553
9*702
9*709
V5J3C
                           95051
                           95112
                           9512*
                           95127
                           95130
                           95333
                           95325
                           V7J27
                           97113
                           97*63
                           97601
                           93020
                           930*3
                           93122
                           9d273
                           98*99
                           98503
                           99o32
                           938C1
                           992C5
                           99336

-------
                           Table A-2.  GM Data Base Listing (Seasonal, Geographical Data)
M UMBER
WT,
SEASON
t'lJPULAT ION S'JU'JRj TERRAIN  ELEVATION   TE1P  REL HU1 PRECIP SNOW-ICE   MODEL
1
z
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
4000.
4500.
5500.
soon.
4500.
5250.
5500.
550C.
5500.
3000.
4000.
450C.
4000.
4COO.
5500.
450C.
5000.
5000.
3500.
4000.
5000.
550C.
4000.
45JO.
4000.
5500.
4500.
3500.
5500.
550P.
3500.
3000.
5250.
4500.
4500.
5500.
4500.
4500.
5500.
40 K.
i250.
£250.
5250.
5pOC.
45)0.
4500 .
5500.
450C.
4000.
H
w
w
w
w
4
M
*
W
s
w
w

-------
50
51
52
53
5*
55
56
57
58
59
60
61
62
63
6*
65
66
67
68
69
70
71
72
73
7*
75
76
77
78
79
80
81
82
83

85
86
87
88
89
90
91
) 2
93
9*
95
96
97
98
99
iOO
1C1
102
103
1C *
i J 2
106
<«50C.
550C.
5250.
5500.
* 0 Jrt •
*500.
50)0.
55 JO .
*5'K .
i 5 0 ri .
3500.
525".
*0 0 0 «
30JC .
5Z50.
*COO.
550C.
5250.
*000 .
*5 O'1 .
5 ? 5^ •
*ooo.
5500.
*530.
5500.
5500.
5500.
*500.
*50C.
5500.
5250.
525C.
5250.
*50C.
',500.
5250.
5250.
5230.
525C.
5250.
5500.
5250.
550T .
550T .
5250.
5250.
-55£*

3500*.
*500.
*0)C.
5250.
5250.
* 5 0^ .
'. 25C.
* 500 .
*9 Jr •
w
*
M
W
^
W
4
w
M
W
w
w
rf
s
w
w
^
ri
w
^
w

w
w
w
M
S
w
M
W
j
W

M
W
Ml
W
4
w
J
w
w
w
^
^
w
w
4
w
w
w
w
4
'*
w
w
M
3 -j . 6 7
27.95
2-.. 35
35. 12
<: 3 . 0 G
30.35
*1.87
* i . 3 fa
c*. Hfc
* t. . i e
1 5 . 0 fc
18. OC
* / . 5 P
35.32
3 J.08
Hi. 75
20.75
i3o .OC
62 . 2.  . 66
27.25
3o.36
51. 31
13.26
2 i . * C
3 c . * t
V. 65
.7.5*
*o90
2151
107COO
1.J700J
19000
70 J
• 31600
* C 0 G 0
3080000
b 030 jy»3
9030UOO
300000
183*5
183*5
2^1573
*6*0
2-. JOO
3763
10900
2600000
1700
17JO
1700
15COO
39300
2800
2800
1 d * 0 C
£3300
23500
175^0
9600
53000
53000
3900
1317
127000
i i 7uuC
16910
5653
5015
3-+800
60C
3522
21 50C 0
9732
11500
2986
50C

2810
nc
905
^500
*1 7*
22300
505JOO
M
S
M
S
N
N
S
s
N
N
N
S
S
S
s
s
N
N
S
hi
S
s
s
s
s
s
s
s
s
s
s
s
s
s
s
N
N
N
M
M
N
r\j
N
N
M
M
N
M
N
tq
M
N|
N
S
rt
S

Al
A2
A2
A2
Al
A2
A2
A2
Al
Al
Al
Al
A2
A2
A2
A2
33
33
Al
Al
32
B2
32
Al
Al
32
82
B2
62
82
82
82
32
32
B*
D5
8*
d*
83
33
33
3*
82
33
32
82
82
82
82
32
82
«2
92
32
83
32
32
6
211
50
50
67
173
90
*2
30
30
30
30
155
155
16
160
500
679
8*
66
50
50
2*0
60
20
119
119
15
8C
80
220
80
1*9
1*9
220
6*C
150
150
185
200
*00
703
398
1133
*06
*60
**3
*95
381
1015
690
1*50
928
820
13*1
6.00
600
3.9
*.l
*.l
*.l
3.9
*.l
3.8
3.8
*.2
*.2
*.2
*.2
*.2
20.7
*.2
*.2
*.2
*.2
*.2
*.2
*.2
*.2
*.2
*.2
*.2
*.2
20.7
*.2
*.2
*.2
*.2
*.2
*.2
*.2
-1.7
-1.7
-1.7
-1.7
-1.7
-1.7
*.2
-.9
-.9
-.9
-.9
-.9
-.9
-.9
-2.7
-.9
-.2
-.2
-.2
-.2
-.2
-.2
-.2
62
68
68
68
62
68
68
68
65
65
65
65
65
76
65
65
b5
65
65
65
65
65
65
65
65
65
76
65
65
65
65
65
65
65
80
90
80
80
ec
80
65
91
91
91
91
91
91
91
83
91
85
85
85
85
35
85
85
121
132
132
132
121
103
102
102
160
160
160
160
160
185
160
160
160
160
160
160
160
160
160
160
160
16C
185
160
160
160
160
160
160
160
65
65
65
65
65
65
160
88
38
88
98
93
38
88
73
88
80
30
80
18
30
80
  1
 28
 28
 23
  1
 20
 30
 30
  5
  5
  5
  5
  5
  0
  5
  5
  5
  5
  5
  5
  5
  5
  5
  5
  5
  5
  0
  5
  5
  5
  5
  5
  5
  5
318
318
313
318
318
318
  5
665
665
665
665
665
665
665
673
665
599
599
599
599
599
599
220*
2506
2639
2303
2*05
2*12
2209
2207
220*
2506
2501
2609
2202
2*02
2505
2202
2302
2505
2605
220
-------
107
108
109
11C
111
112
113
114
115
lib
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151

153
154
155
156
157
158
159
16C

362
163
525C.
5250.
5250.
553C.
^ 2 51" .
4500.
5530.
5530.
5 2 5 ('• .
Is 2 5 C .
'j 'j 3^ .
5?50.
4\i 3rt .
5230.
5500.
525C.
4030.
5250.
4030.
4500.
5250.
5250.
5?5C.
5250.
4000.
c ? 5C .
5000.
5250.
400?,.
5350.
5000.
4000.
5030.
403C.
5250.
33 JC .
4<>r,o.
3500. '
•* 5D^ .
5 ' 5*" .
5250.
525C.
4500.
5 2 5 C .
4 f DC .
3250.
5500.
.. "/ • J >' •
*t •'"' ,) V »
5250.
4500.

4530*
400C.
4000.
525C.

W
w
ri
S
i/l
S
M
ri
w
w
w
W
HI
w
w
4
M
W
w
w
w
W
W
„'
w
w
M
W
W
W
^
ri
W
4
W
M
W
W
H
W
S

S
M
w
M
W
«;
w
w
w
w
w
M
W

W
t £ . 't't
LI. 02
is>.3t
3-1.14
23. OH
:• 9 . 5 7
29.46
i i.46
j o . 9 j
t 0.33
? o . i 7
44 . be
A > .19
2-^.36
3 J . 3 b
IS. 43
14. i8
12.d«t
13.65

3. ifc

13^39
2i. 79
33.07
27.0C
46.11
9o
7200

i'tZOO
•t i 5 0 0
415JO
1971
136300
67000
2496
1390
313
9303
98C3
75000
750CO
1759
32500
52500
52500
60000
13COC
7972
o209
3594
129 JO
19530
19500
11800
36000
N
S
S
S
S
S
S
N

S
N
S
S

s

N

S
N
N
fj
N
N
N
M
S
N
N
N
N
N
S
M
N
N
N
N
N
N
N
N
N
N
M
N
M
N
N
N
N
S
s
s
s
s
s
82
82
82
B2
62
B2
82
82
82
32
B2
04
04
04
D4
04
04
04
D4
04
D4
04
D4
04
04
04
D4
C5
C5
C5
C4
83
33
C4
B2
C5
C5
83
B2
C5
Cb
32
82
C5
33
83
83
83
C5
C5
83
C4
C5
C5
C5
83
83
600
68C
680
63C
650
650
280
620
1400
420
515
860
i200
773
860
1180
760
760
760
760
760
760
7bO
76C
760
76&
984
1100
1100
1100
1310
360
660
1340
744
1206
2167
640
475
400
400
360
360
560
400
400
400
360
440
400
540
1240
569
544
544
100
250
-.2
-.2
-.2
2C.O
-.2
2C.O
-.3
-.3
-.2
-.3
-.3
.3
.3
.3
.3
.3
.3
.3
.3
.3
.3
.3
.3
.3
.3
.3
.3
1.9
1.9
1.9
.3
-.8
-.8
1.2
-.6
1.9
1.9
-.6
1.9
1.9
21.5
1.9
21.5
1.9
1.9
1.9
1.9
1.9
1.9
1.2
1.8
1.3
1.3
1.3
1.3
4.1
4.1
85
85
85
75
85
75
83
83
85
83
83
76
76
76
76
76
76
76
76
76
76
76
76
76
76
76
76
76
7b
76
76
79
79
71
85
76
76
76
76
77
76
77
76
76
76
76
76
76
71
75
74
74
74
74
68
68
30
80
80
93
80
93
73
73
30
73
73
102
132
102
102
102
102
132
102
102
102
102
102
132
132
102
132
117
117
117
102
77
77
114
91
117
117
117
117
165
117
165
117
117
117
117
117
117
114
115
86
86
86
86
103
103
599
599
599
  0
599
  3
673
673
599
673
673
538
538
538
538
538
538
5J8
538
538
536
53$
538
53d
538
536
533
 13
 13
 13
533
516
518
117
511
 13
 13
511
 13
 13
  G
 13

 13
 13
 13
 13
 13
 13
117
 81
132
132
132
132
 20
 20
2206
2505
2206
2207
25D5
2412
2207
2506
26 J9
2206
2506
2409
2405
2609
2303
2t>09
2405
2505
2406
2407
2609
2609
2505
2609
24C6
2639
2209
2409
2605
2505
2239
2635
2209
2405
2505
2506
2405
2499
2204
2409
25C5
2409
241Z
2409
2204
2505
2302
2506
2605
2409
2204
2506
2406
2405
2502
2609
2204
OJ
Ul

-------
164
165
166
167
168
169
173
171
172
173
174
175
176
177
178
179
180
131
132
±83
Id4
183
196
187
138
189
190
191

193
19*
195

197
198
199
200
201
202
2C3
204
203
23t
207
208
209
2K
211
212
213
21*
215
216
217
2id
219
22L
400J
4500
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4«>0r
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4000
4590
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5 7 DC
52 50
4030
4300
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5 5 jr
433C
5 ? 50
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5500
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37. db
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16.24
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88.75
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175500
65100
8085
95976
12100
107*00
107*00
16300
3*300
d * 3 JG
315000
b 3 5 u U 0'
535000
535000
500
21500
2&5000
*^ ' 1
1903
2322
13100
2C800
13100
* 9000 0
8100
1-tSOOO
2580C
26800
913
ib3000
15302
N
N
S
S

N
S

5
5
S
N
S
N
M
S)
N
M
N
N
N
N
N
N
N

N
N
M
S
S
M
N
N|
M
N
N
N
M
N
N
r\|
N
N
N
N
•^
N
S
N
M
N
N
N
N
N
N
N
                                          B*
                                          B*
                                          B*
                                          B*
                                          B*
                                          3*
                                          8*
                                          06
                                          C5
                                          C5
                                          C5
                                          C5
                                          B*
                                          B3
                                          33
                                          93
                                          B5
                                          35
                                          85
                                          C5
                                          C5
                                          C5
                                          Al
                                          Al
                                          Al
                                          D6
                                          Al
                                          Al
                                          C5
                                          C5
                                          C5
                                          C5
                                          C5
                                          C5
                                          C5
                                          C5
                                          C5
                                          C5
                                          C5
                                          C5
                                          C5
                                          D5
                                          B
                                          A
                                          83
                                          33
                                          06
                                          06
                                          83
                                          33
                                          83
                                          83
                                          B3
                                          83
                                          C3
                                          06
                                          B3
                                          32
287
287
66
75
*7
*7
287
13500
287
287
287
720
*33
39
*2
*2
*20
975
1275
520
50
50
*59
290
*0t>
2220
29*
29*
50
50
130
23
152
152
33*
35
85
65
65
65
65
3967
160
25
60
796
*59
*105
b6
**0
125
31
250
100
21
727
1000
380
18.1
18.1
18.1
18.1
18.1
18.1
19.3
18.1
18.1
18.1
13.1
18.1
1P.1
13.3
18.3
18.3
18.1
18.1
18.1
18.1
18.1
18.1
27.3
27.3
27.3
27.3
23.7
23.7
16,2
15.*
15.*
16.2
16.2
16.2
15.*
J.5.*
15.*
15.*
15.*
15.*
15.*
21.2
22.9
22.9
16.6
16.6
16.6
17.7
15.9
15.9
15.9
15.9
15.9
1*.2
16.6
15.9
15.1
18.2
80
80
80
80
80
80
73
80
80
80
80
80
8C
71
71
71
80
30
3C
80
ac
80
33
33
33
33
*3
*3
76
70
70
76
76
76
70
70
70
70
70
70
70
33
51
51
63
63
75
*9
65
65
65
65
65
69
63
65
5*
5*
 1
 1
 0
 0
 0

 0
 0
 0
 0
 0
 0
 0
 0
 0
 1
 0
 0
 c
 c
 0
 c
 0
 0
 0
 0

 1
 1
 2
 ?
 I
 1
 1
 1

 1
 1

 2
 1

29
29
22
10
21
21
21
21
21
18
29
21
37
12
-0
-0
-0
-0
-0
-0
-0
-0
-0
-0
-0
-a
-0
-0
-0
-0
-0
-0
-0
-0
-0
-0
-0
-a
-0
-0
-0
-0
-0
-0
-0
-0
-0
-0
-0
-0
-0
-0
-0
-0
-0
-0
-0
-0
-0
-0
-0
-0
-0
-0
-0
-0
-0
-0
-0
-0
2201
2502
2207
2202
2635
2*07
2502
2*05
2606
2*02
260*
2501
2302
2*99
2501
2*99
2302
2601
2206
2*99
2*09
2631
2201
2603
2601
2502
2207
2303
2605
2*07
2303
2638
2207
2*05
2303
2202
2303
2302
2201
2*02
2202
2502
2*05
2303
220*
2606
2502
260*
2609
2*02
2501
2601
2606
2*07
260*
2501
2*12
2506

-------
          APPENDIX B






FUEL ECONOMY SCATTER PLOTS
              B-l

-------
                               APPENDIX B
                    FUEL ECONOMY SCATTER PLOTS
         This appendix contains 192 scatter plots  that illustrate the variation
between fuel economy (mpg) and each of eight parameters (population, zip
code,  terrain index, elevation, relative humidity, precipitation,  tempera-
ture, and average miles per day) for 24 carline classes that contain at least
20 cars.  These carline classes have the following parameters in common:
Division (of General Motors),  Inertia Weight, CID and BBL,  Transmission
Type,  and Axle Ratio.  (Refer to Table 2-5 for an explanation of the class
code.)  Also displayed on each plot is a correlation coefficient and a 95-
percent confidence interval for that correlation coefficient.
         For each class of cars,  the first plot shows mpg versus population
of the  city in which  the driver resides.   Because  of the large range in popu-
lation  associated with this  study, those cities with populations greater than
or equal to 100,000  are shown plotted as  cities with exactly 100,000 people.
Actual populations were, of course, used in the computation of the correla-
tion coefficients and confidence intervals.
         The second plot shows mpg versus the first  digit of the zip code of
the driver's address.  (The zip code scale includes "10" due to an idiosyn-
crasy in the plotting subroutine used.)
         The third plot for each class of cars shows mpg versus the terrain
index.   Actually, only that portion of the terrain index was used that corre-
sponds  to the local slope of the city in which the driver resides.  (Refer to
Section 2 for a more detailed discussion of this factor.)
         The fourth  plot shows mpg versus the average elevation above sea
level of the city  in which the driver resides.  Elevations greater than or
equal to 5000 feet are shown plotted at 5000 feet.  Actual elevations were
used in the  computation of  the correlation coefficients  and confidence
intervals.
                                   B-3

-------
         The fifth,  sixth, and seventh plots for each class of cars show mpg
versus relative humidity, precipitation, and temperature respectively. These
weather data correspond to averages over the months of December 1974 or
June 1975 depending on whether the fuel economy data were  acquired from
the low mileage winter  survey or the low mileage spring-summer survey.
(Refer to Section 2  for further discussion of this  factor.)
         The eighth and final plot shows mpg versus miles per day averaged
over the  duration of the test.
                                  B-4

-------
  52.                          GM  FUEL ECONOMY  STUDY
                              MPG UERSUS POPULATION
  48.                          CLASS       13000313
            DATE       062476
  44.        CORRELATION COEFFICIENT =-.0291
            95  PERCENT CONFIDENCE INTERUAL = (-.4118,  .3623)
  40.
  36.
  32.
  28.
  24.  X
         X                                                        *
          Y    v                                       XX
&.         XX
<£                                                                 y
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                                                                                                   I
                                                                                                   01
X
12.  ^     |0_    20.    30.    40.    50.    60.    70.    80.    90.    100.
    -•• POPULATION (THOUSANDS)

-------
 <-,?.                          Gfl FUEL  ECONOMY STUDY
                             MPG UERSUS  ZIP CODE
 «„.                          CLASS        13000313
           DATE       062476
 44.        CORRELATION COEFFICIENT =-.1135
           95  PERCENT CONFIDENCE  INTERUAL = (-.4798,  .2864)
 40.
 36.
 32.
  28.
  24.                                           X
     X     X
<*                X     X     X                            X
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5                                             xx
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      0.     1.     2.     3.     4.     5.     6.     7.     8.     9.      10.
      -ZIP  CODE (FIRST DIGIT)
                                                                                                tfl

-------
      52.                          CM FUEL  ECONOMY STUDY
                                  hPG UERSUS TERRAIN  INDEX
      48.                          CLASS        13000313
                DATE       062476
      44.        CORRELATION COEFFICIENT =-.0399
                95 PERCENT CONFIDENCE  INTERUAL - <-. 4208, .3529)
      40.
      36.
      32.
      28.
                            X
      24.                    X
    
-------
 52.                           CM  FUEL ECONOMY STUDY
                              MPG UERSUS  ELEUATION
 48.                           CLASS        13000313
            DATE       062476
 44.         CORRELATION COEFFICIENT  =-.1457
            95 PERCENT CONFIDENCE  INTERUAL = (-.5046.  .2561)
 40.
  36.
  32.
  28.
       X
  24.           x
          XX
      X X   x

a
      x
td
i
00
  I2'   0.     500.    1000.   1500.   2000.   2500.  3000.   3500.   4000.   4500.   5000.
X     -  ELEUATION  (FT)

-------
  52.
  48.
  44.
  40.
  36.
  32.
  28.
                        GM FUEL ECONOMY  STUDY
                        MPG  UERSUS RELATIUE  HUMIDITY
                        CLASS        13000313
      DATE       062476
      CORRELATION COEFFICIENT =  .0158
      95  PERCENT CONFIDENCE  NTERUAL  = (-.3738.  .4007>
                                                                                                   sD
  24.
o

-------
24.
52.                          GM  FUEL ECONOMY  STUDY
                            MPG UERSUS PRECIP  TAT I ON
48.                          CLASS         13000313
          DATE       062476
4,.        CORRELATION COEFFICIENT = .2556
          95 PERCENT CONFIDENCE INTERUAL  = (-.1463,  .5850)
40.
36.
3?.
                                                                                                   w
                                                                                                   I

ix X X
X7°- X *XX
5 x x

-------
  52.                           GM FUEL  ECONOMY STUDY
                              MPG UERSUS  TEMPERATURE
  48.                           CLASS        13000313
            DATE       062476
  44.         CORRELATION COEFFICIENT = .1998
            95 PERCENT CONFIDENCE  INTERUAL = (-.2033,  .5450)
  40.
  36.
  32.
  28.
                           X
  24.                        X
o

-------
44.
40.
36.
32.
28.
                  CM  FUEL ECONOMY  STUDY
                  riPG UERSUS MILES PER DAY
                  CLASS        13000313
DATE       062476
CORRELATION COEFFICIENT =  .6972
95 PERCENT CONFIDENCE  INTERUAL = < .4245,  .8540)
                                                                                                  I
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                  20.
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40.
       MILES  PER DAY
I
50.
60.
70.
                         30.
90.
100.

-------
  52.    '                      GM FUEL  ECONOMY STUDY
                              MPG UERSUS POPULATION
  48.                          CLASS        13000323
            DATE       062476
  44.        CORRELATION COEFFICIENT =-.1017
            95 PERCENT CONFIDENCE  INTERUAL =  <-.5018,  .3343)
  40.
  36.
  32.
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                                                                                                    ta
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  12.  ^     {0_    ^o.    30.    40.    50.    60.    70.    80.    90.    100.
x     •»  POPULATION (THOUSANDS)

-------
57.
4P.
44.
  40.
  36.
  32.
  28.
                             GM  FUEL ECONOMY  STUDY


                             MPG UERSUS ZIP CODE


                             CLASS       13000323


            DATE      062476


            CORRELATION  COEFFICIENT =-.2015


            95 PERCENT CONFIDENCE  I NTERUAL  =  (-.5743, .2405)
                                                                                                 W
                                                                                                 I

-------
  52.                          GM FUEL  ECONOMY STUDY
                              MPG UERSUS TERRAIN  INDEX
  48.                          CLASS        13000323
            DATE       062476
  44.        CORRELATION COEFFICIENT = .1621
            95 PERCENT CONFIDENCE  INTERUAL  =  <-.2785, .5464)
  40.
  36.
  32.
  28.
         X              X
                                       *
  24-                    |
                                       £
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-------
  ?,:,.                            GM FUEL  ECONOMY  STUDY
                               MPG UERSUS ELEUATION
  48.                            CLASS        13000323
            DATE       062476
  44.         CORRELATION  COEFFICIENT --.0132
            95  PERCENT CONFIDENCE  INTERUAL = (-.4324,  .4107)
  40.
  32.
  28.
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  24'            x><
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      0.     500.    1000.   1500.   2000.   2500.   3000.    3500.   4000.   4500.   5000.
      023  ELEUATION (FT)

-------
  52.                          CM FUEL ECONOMY STUDY
                              MPG UERSUS  RELATIUE HUMIDITY
  48.                          CLASS        13000323
            DATE       062476
  44.        CORRELATION COEFFICIENT --.0156
            95 PERCENT CONFIDENCE  INTERUAL = <-.4343,  .4087)
  40.
  36.
  32.
  28.
  24.
  20.
5
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  12.   ^0_     ^g.    go.    65.    70.    75.    80.    85.    90.     95.     100.
x     -  RELATiUE HUMIDITY  (PERCENT)

-------
  52.                           CM FUEL  ECONOMY STUDY
                              MPG UERSUS PRECIPITATION
  48.                           CLASS        13000323
            DATE       062476
  44.         CORRELATION COEFFICIENT = .0569
            95 PERCENT CONFIDENCE  INTERUAL =  <-. 3736,  .4673)
  40.
  36.
  32.
  28.       X
        X                      X
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            20.     40.     SO.     80.     100.    120.    140.    160.   180.   200.
         PRECIPITATION < MM)

-------
  52.                          GM FUEL  ECONOMY STUDY



                              MPG UERSUS TEMPERATURE



  48.                          CLASS        13000323



            DATE       062476



  44.        CORRELATION COEFFICIENT = .2139



            95 PERCENT CONFIDENCE  INTERUAL  =  <-.2283, .5829)



  40.
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-------

LU

5 is.
C9
                              Gr  FUEL ECONOnY  STUDY
                              F1PG UERSUS MILES PER DAY
                              CLASS        13000323
            DATE      062476
            CORRELATION  COEFFICIENT =  .4423
            95 PERCENT CONFIDENCE  INTERUAL = < .0255,  .7281)
                                                                                                   W
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  '*   0.      10.     20.     30.     40.     50.     60.     70.     80.     90.     100.
      ™  fllLES PER DAY

-------
  28.
  26.
  24.
  22.
                            GM FUEL  ECONOMY STUDY
                            nPG UERSUS POPULATION
                            CLASS        14000612
          DATE       062476
          CORRELATION COEFFICIENT =-.1365
          95  PERCENT CONFIDENCE  INTERUAL =  <-. 4631,  .2228)
  20.
                                                                                                  w
                                                                                                  I
Oi

-------
  28.                          GM FUEL  ECONOMY STUDY
                             MPG UERSUS  ZIP CODE
  26.                          CLASS        14000612
            DATE      062476
  24.         CORRELATION COEFFICIENT =-.0177
            95  PERCENT CONFIDENCE  INTERUAL = (-.3642.  .3330)
  20.
  19.
           X
  '6-
5

-------
  28.                          Gtl FUEL ECONOMY STUDY

                              MPG UERSUS  TERRAIN  INDEX

  26.                          CLASS        14000612

            DATE       062476

  24.        CORRELATION COEFFICIENT  =-.1804

            95 PERCENT CONFIDENCE  INTERUAL = (-.4978,  .1796)


  22.
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-------
28.                          Gil  FUEL ECONOMY STUDY
                            MPG UERSUS ELEUATION
26.                          CLASS        14000612
          DATE       062476
24.        CORRELATION COEFFICIENT =-.3003
          95  PERCENT CONFIDENCE  I NTERUAL = (-.5875.  .0540)
2?.
20.
18.
X X
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14.
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£
o
512'

-------
  28.                          GM FUEL ECONOMY  STUDY



                              MPG  UERSUS RELATIUE HUMIDITY



  26.                          CLASS        14000612



            DATE       062476



  24.        CORRELATION COEFFICIENT --.1078



            95 PERCENT CONFIDENCE I NTERUAL  = (-.4400,  .2503)



  22.







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                                            X                                                       W
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-------
                              Gfl FUEL  ECONOMY STUDY



                              MPG UERSUS PRECIPITATION



  K.                           CLASS        14000612



            DATE       062476



  2«.         CORRELATION COEFFICIENT = .3098



            95 PERCENT CONFIDENCE  INTERUAL =  (-.0436, .5943)



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-------
  28.
  26.
  24.
  22.
                              GM FUEL ECONOMY STUDY
                              MPG UERSUS  TEMPERATURE
                              CLASS        14000612
            DATE       062476
            CORRELATION  COEFFICIENT  =  .5174
            95 PERCENT CONFIDENCE  INTERUAL = ( .2058,  .7337)
  20.
                                                                                                   to
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                                    12.
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 24.
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-------
  28.                           GM FUEL ECONOMY  STUDY
                              MPG UERSUS MILES PER DAY
  ?6.                           CLASS        14000612
            DATE       062476
  24.         CORRELATION COEFFICIENT = .5737
            95 PERCENT CONFIDENCE  I NTERUAL  - < .2813,  .7686)
  22.
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-------
28.
26.
24.
  22.
  20.
  18.
                              CM FUEL  ECONOMY STUDY
                              MPG UERSUS POPULATION
                              CLASS        14000912
            DATE       062476
            CORRELATION COEFFICIENT =-.2849
            95 PERCENT CONFIDENCE  I NTERUAL =  < -. 5478,  .0292)
                                                                                                    w
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         POPULATION (THOUSANDS)
                                                                  100.

-------
  28
  2B.
  24.
27.
                           GM  FUEL ECONOnY STUDY
                           MPG UERSUS ZIP CODE
                           CLASS       14000912
          DATE      062476
          CORRELATION COEFFICIENT = .2273
          95 PERCENT CONFIDENCE I NTERUAL  =  (-.0907,  .5032)
20.
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-------
  28.                           GM  FUEL ECONOMY  STUDY

                              MPG UERSUS TERRAIN INDEX

  2B.                           CLASS        14000912
            DATE      062476

  24.         CORRELATION  COEFFICIENT =-.2580

            95 PERCENT CONFIDENCE  INTERUAL = (-.5271.  .0582)

  22.
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°        v               ^                             X
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C3                       X
^                                                    X


  8.   _'80    |.2    1.6    2.      2.4    2.8    3.2   3.6    4.     4.4    4.8

x     »   TERRAIN  INDEX
                                                                                                  td
                                                                                                  i
                                                                                                  OO

-------
28.                           GM FUEL ECONOMY STUDY
                             MPG  UERSUS ELEUATION
26.                           CLASS         14000912
          DATE       062476
2<.        CORRELATION COEFFICIENT -  .0053
          95  PERCENT CONFIDENCE  INTERUAL = (-.3067.  .3163)
22.
  20.


  18.

              *X
                  X
  16.           Xx         X
            XX
            x       x
          XX                X
  14.                             v
      X                         x
               X>^
           XV V ""* * V
       •V   A. A.  V^ A.
       A        ^>i
or

-------
  28.                           GM FUEL ECONOMY STUDY
                              MPG UERSUS  RELATIUE HUMIDITY
  26.                           CLASS        14000912
            DATE       062476
  24.         CORRELATION COEFFICIENT  =  .0201
            95 PERCENT CONFIDENCE  INTERUAL = (-.2933,  .3295)
  22.
  20.
  18.

                                    X      X
                 X
              XX
X                     X   X
  16.                        XX           x

                              X                 X
                                     X X
                                     Xx    X   X >w
                                   X  *        *

-------
 2E.
 24.
  22.
  20.
  18.
                            GM FUEL ECONOnY STUDY
                            MPG UERSUS  PRECIPITATION
                            CLASS        14000912
          DATE       062476
          CORRELATION COEFFICIENT  =-.0078
          95 PERCENT CONFIDENCE  INTERUAL = (-.3185,  .3045)
                                                                                                   w
                                                                                                   I
                                                                                                   UJ
  16.
  14.
s12'
a
ui
g
"- 10.
8t   0.
           20.    40.    60.
        PRECIPITATION (MM)
                              X
                              X
                                      X
                                    X    X
                                  X
                               x     x
                                   X
                                   X
                                    X
                                    X
100.
120.
140.
1BO.
180.
200.

-------
  28.                           GM FUEL ECONOMY STUDY
                              MPG UERSUS  TEMPERATURE
  26.                           CLASS        14000912
            DATE       062476
  24.         CORRELATION COEFFICIENT =  .2894
            95 PERCENT CONFIDENCE  INTERUAL = (-.0243,  «5512)
  22.
  20.
  18.
                                                 X
  16.       x                               XX
                    X       X
                 X            X
               x   x
                  x                  x
                •x x      £
cc                      x  X
° 12.             X                             X
I                   X   *
u
o               X  X     x
u- 10.       X    X
  8.  _^    -J,.     o.     4.     g.     12.    16.    20.    24.    28.     32.
x     -  TEMPERATURE (
                                                                                                    W
                                                                                                    i
                                                                                                    OO
                                                                                                    Ui

-------
 2B.                           Gfl FUEL ECONOMY  STUDY
                              MPG UERSUS MILES PER DAY
 2B.                           GLASS        14000912
            DATE       062476
 24.         CORRELATION COEFFICIENT =  .5721
            95 PERCENT CONFIDENCE  INTERUAL = < .3171,  .7500)
20.


18.

                X      X
                               X
1C                      \s ^C
1 Da                      /S.
                        X   X
                         x x
                       xxx
t«.                      x
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a
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8             ^>
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t             X
r             x
            i      i      i      i      i      i       i      i      i      i
            10.     20.     30.    40.    50.    60.     70.     80.     90.     100.
         MILES PER DAY
                                                                                                     w

-------
  26.                          GM  FUEL ECONOMY  STUDY

                              MPG UERSUS POPULATION

  24.                          CLASS        14500912
            DATE       062476

  22.        CORRELATION COEFFICIENT --.2497

            95 PERCENT CONFIDENCE  INTERUAL = <-.4474, -.0288)

  20.
  16.   X
            X
      \s #£ X
x
      x x      x                                          x
                                                             X
  H-   >

-------
26.                         GM FUEL  ECONOMY STUDY
                           MPG UERSUS ZIP CODE
24.                         CLASS        14500912
          DATE      062476
22.        CORRELATION COEFFICIENT =-.0083
          95 PERCENT CONFIDENCE  INTERUAL = (-.2304,  .2146)
18.

16.

14.
v

12.

Of
o X
§
Ul
g
LL. O
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x x
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X
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2 x
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X
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X X
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X

g   I      I      I     I      I      I      I      I      I      I     I
0<   0.     1.      2.     3.     4.     5.     6.     7.     8.      9.     10.
    •*  ZIP CODE (FIRST  DIGIT)
                                                                                               ttf
                                                                                               i
                                                                                               OJ
                                                                                               00

-------
  26.                          GM  FUEL ECONOMY STUDY


                             MPG UERSUS TERRAIN  INDEX


  24.                          CLASS        14500912

            DATE      062476


  22.         CORRELATION  COEFFICIENT =-.0085


            95 PERCENT CONFIDENCE  INTERUAL =  (-.2306, .2144)


  20.
X                                                                                        w
  IB.     X
                       N
S ,0.                   «



I        X              *


g                      X

LL 8.                    X

CD
O-

                                                                                                  td
                                                                                                  i
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                                                                                                  vO
         x                                            *
         x                             *
                                      x
  6.   .'80    {.2    1.6    2.     2.4    2.8    3.2    3.6    4.     4.4    4.8

x     -   TERRAIN  INDEX

-------
                             GM FUEL ECONOMY STUDY
                             MPG UERSUS  ELEUATION
24.                           CLASS        14500912
          DATE       062476
27.        CORRELATION COEFFICIENT  =-.0376
          95  PERCENT CONFIDENCE  INTERUAL = (-.2580.  .1865)
  1B-                             x
               X
  16.          X
        X     X XX      Xy
             X   XXX   X
            X  v
             V  X         X
  M-    x X*O   x
       V*     ' ' ^
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       x  x     $?

         xX^ ^x                                             X    X
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€C     v^
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§     x     xx
HJ               X      x
g              x  x                                       x
^ 8.           X
CD
£

  6-   0.     500.   1000.   1500.   2000.   2500.   3000.   3500.   4000.   4500.  5000.
X     « ELEUATION  CFT)
                                                                                                  w
                                                                                                  I

-------
  26.                          GM FUEL ECONOMY STUDY

                              MPG UERSUS  RELATIUE HUMIDITY

  24.                          CLASS        14500912

            DATE       062476

  22.        CORRELATION COEFFICIENT  =-.0991

            95 PERCENT CONFIDENCE  I NTERUAL = (-.3147,  .1262)


  20.
  16.                                   X


                                X X
                          x x   xx  *    X

                         x  x    xx             x
  14-                        x   x     x           x
                                     V ^        V


                           X  X  *      xx   x
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                         X            X
  17                        x   x      X   v        X
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                                              X
                               v      xXx   v
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a;                             X    x         x

o                          X      XX
  10.                       x

o                          X  X                  X

-------
  7B.                         Gh  FUEL  ECONOMY STUDY


                            MPG UERSUS PRECIPITATION


  24.                         CLASS        14500912


           DATE      062476


  22.        CORRELATION COEFFICIENT = .0553


           95 PERCENT CONFIDENCE INTERUAL = <-. 1693.  .2745)


  20.
'8-    x
  16.                  X

                     X          X
           X      V  v*    X
                 X X  X"   X        X
               X    x
               X*V     ^    ^
               V    V'N    ^
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             ^      N/          \^


          «•**,«*"*     *
  12.    x  ^X   X     X      X



a           XX

0 10.          xxx     x


I           x   x   x
UJ             X  y

g      x    x        x
u- 8.                    X
C3
 6-   0.     40.    80.    120.    160.   200.    240.   280.    320.   360.   400.

     -  PRECIPITATION *»•

-------
26.
24.
22.
  20.
  18.
                              GM  FUEL ECONOMY  STUDY
                              MPG UERSUS TEMPERATURE
                              CLASS        14500912
            DATE       062476
            CORRELATION  COEFFICIENT =  .3458
            95 PERCENT CONFIDENCE  I NTERUAL = (  .1335,  .5277)
  16.

  12.
a/

-------
                              GM FUEL ECONOMY STUDY
                              MPG UERSUS MILES PER DAY
  2<1.                           CLASS        14500912
            DATE      062476
  „.         CORRELATION  COEFFICIENT =  .4056
            95 PERCENT CONFIDENCE  INTERUAL = < .2012,  .5761)
  20.
  18.
                                 X
                                 X
                            XX
                      X
                    x    x
  M'             x    x  x
                   XX  t>
                       X^x
                „    v
                ^    '^^
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           x   x    x      x
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I 10.          *    x   x
I          x xx
                  x           x
g
u- 8.
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      0.     10.     20.     30.     40.     50.     SO.     70.     80.     90.     100.
X     -   MILES PER DAY
                                                                                                   w

-------
  28.                          CM  FUEL ECONOMY  STUDY


                              MPG UERSUS POPULATION


  26.                          CLASS        15250914


            DATE       062476


  24.        CORRELATION COEFFICIENT =-.2621


            95 PERCENT CONFIDENCE  INTERUAL = (-.5402,  =0677)


  22.





  20.                                                                                                td


                                                                                                    ui


  18.





  16.


      X                              X

                                                                  X
  14.    X

                                                                  X
       X                     X                           XX
Q/     ^ )$C                                                          S/

g 17     *               x                                          *
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Q-                                                                 »^
X
    ,,|||||!lll
8.   ^     Jo.    20.     30.     40.     50.     60.    70.    80.    90.    100.

    •»  POPULATION  (THOUSANDS)

-------
2R.                         GM  FUEL ECONOMY STUDY

                           P1PG UERSUS ZIP CODE

2B.                         CLASS       15250914

          DATE      062476

24.        CORRELATION  COEFFICIENT = .0343

          95 PERCENT CONFIDENCE INTERUAL =  (-.2929,  .3544)


77.
20.
18.
16.
                     X

                                       X
                           XX
               x     x     x     x
                     XX           *
tt


X
X
^
X

X
                                                                                                a
                                                                                                I
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    0.     1.     2.      3.     4.     5.     6.     7.     8.     9.     10.

    ~  ZIP CODE (FIRST  DIGIT)

-------
  28.             *             GM  FUEL ECONOMY  STUDY
                             MPG UERSUS TERRAIN  INDEX
  26.                          CLASS       15250914
            DATE      062476
  24.         CORRELATION  COEFFICIENT =  .0281
            95 PERCENT CONFIDENCE  INTERUAL = C-.2986, =3489)
  22.
  20.
  18.
  16.
s „      a               x
x 12-      x               x
  10.
                                                                                                  w
                                                                                                  4^
                                                                                                  -vl
8-   .'80    1.2    1.6    2.     2.4    2.8    3.2    3.6    4.    4.4   4.8
      .80
          TERRAIN  INDEX

-------
  28.
  24.
                        GM FUEL ECONOMY  STUDY
                        NRG UERSUS ELEUATION
                        CLASS        15250914
      DATE       062476
      CORRELATION COEFFICIENT =  .2562
      95 PERCENT CONFIDENCE  INTERUAL  = (-.0739.  .5358)
  20.
  18.
                                                                                                     w
                                                                                                     I
                                                                                                     £

-------
  28.                           GM FUEL ECONOMY STUDY
                              MPG UERSUS  RELATIUE HUMIDITY
  26.                           CLASS        15250914
            DATE       062476
  24.         CORRELATION  COEFFICIENT  =-.0548
            95 PERCENT CONFIDENCE  INTERUAL = (-.3722,  .2741)
  22.
  20.
  18.
  16.
                                  x
                                  X   X
                          x
  14.
                          y     x
*                         x     * 5Xx    x
n
° 12.                    x         X         X
S                             x   *   *
LU                          v  * vr
                                       v
g                             x         x    x
U- 10.
                                                                                                   w
                                                                                                   I
                                             XX
      i      r      I      I      'I      I      I      I      I      I      '
  8.   ^Q_     ^5.    60.    65.    70.    75.    80.     85.     90.     95.     100.
      »"  RELATIUE HUMIDITY (PERCENT)

-------
?P_                          GM  FUEL ECONOMY  STUDY


                            MPG UERSUS PRECIPITATION


2r,_                          CLASS        15250914
          DATE       C?2476


          CORRELATION COEFF


          95 PERCENT CONFIDENCE  INTERUAL = (-.3741,  .2721)
 24         CORRELATION  COEFFICIENT  =-.0570






 22.






 20.                                                                                                 td

                                                                                                    I
                                                                                                    U1
                                                                                                    o

 18.






 16.


                 x   *   *


                  x    x
 14.                    X

              X
             V        ^
ot     X       xv  X      X               x

§ ._    x      x*  X
 12.              X           XX


I         XX  ><      x 5      X

g            x       xx      x
"- 10.                v
a                  A

fc             x



 8-  o.     40.    80.    120.   160.    200.    240.    280.    320.    360.    400.

X    -  PRECIPITATION 
-------
  28.                           GM FUEL ECONOMY  STUDY
                              MPG UERSUS MILES PER DAY
  26.                           CLASS        15250914
            DATE      062476
  24.         CORRELATION  COEFFICIENT  =  .3654
            95 PERCENT CONFIDENCE  NTERUAL = ( .0469,  .6164)
  22.
  20.
  18.
u- 10.
CD
  16.
                X
  14.
                                       X
                   X vy   ^S ^>
*               5  *****     x
                        *
                                     X

                                                    X            X
  8.   b.     10.    20.    30.    40.    50.     60.     70.     80.     90.     100.
x     '«  MILES PER  DAY
                                                                                                   td

-------
  2B.                           GM FUEL  ECONOMY STUDY
                              MPG UERSUS TEMPERATURE
  2fi.                           CLASS        15250914
            DATE       062476
  24.         CORRELATION COEFFICIENT = .2742
            95 PERCENT CONFIDENCE  INTERUAL = (-.0547,  .5494)
  22.
  20.
  18.
                                          X *   x
                                                  x    x
                 X
                *^r\                                 \S       XX
g         "x   x *                             X  xX   x   %
5"-              X      x  x      x
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8              xx                                 x xX
^ 10.
U               X
t
  8<  -8.     -4.      0.      4.    8.      12.     16.     20.     24-     28.     32.
      '"   TEHPERATURE (DEG C)
                                                                                                   a
                                                                                                   i
                                                                                                   
-------
  28.                           GM FUEL ECONOMY STUDY
                              MPG UERSUS  POPULATION
  26.                           CLASS        15251212
            DATE       062476
  24.         CORRELATION  COEFFICIENT  =  .0809
            95 PERCENT CONFIDENCE  INTERUAL = (-.3246,  =4613)
  22.
  20.
  18.
  1B.
  14.    X                                                        X
                                                                 X

a:
o _
o

-------
  28.                          GM  FUEL ECONOMY  STUDY
                             MPG UERSUS ZIP CODE
  26.                          CLASS       15251212
            DATE      062476
  24.         CORRELATION COEFFICIENT =  .0955
            95 PERCENT CONFIDENCE INTERUAL  =  (-.3114. .4728)
  22.
  20.
  18.
  16.
  14.
           *           X
8
u- 10.
           x                       x
           X
           X
0 12.        X           X     ~     X
U)
                                                                                                   td
      lllllllllll
      0.      1.     2.     3.     4.     5.     6.     7.     8.     9.     10.
      '"ZIP CODE (FIRST  DIGIT)

-------
  28.                           CM FUEL ECONOMY STUDY

                              MPG UERSUS  TERRAIN  INDEX

  26.                           CLASS        15251212

            DATE       062476

  24.         CORRELATION  COEFFICIENT  -  .0835

            95 PERCENT CONFIDENCE  INTERUAL = (-,3222,  .4634)

  22.
  20.
  18.
  16.
  14.
                        v               8               X
         X               X
ft!                       y

-------
  7R.                            GM FUEL  ECONOMY  STUDY
                               MPG UERSUS ELEUATION
  :.Cl.                            CLASS        15251212
            DATE       062476
  24.         CORRELATION  COEFFICIENT =-.1840
            95  PERCENT CONFIDENCE  INTERUAL  =  <-. 5399,  .2277)
  27.
  20.
  IB.
  16.
        X

  14.                             X
                                     X
                  X  V         \s         ^
       x             *         x            x
g                X                          X
0 12.          X          X       X*
5                      x

-------
  28.                         GM  FUEL ECONOMY STUDY
                             MPG UERSUS RELATIUE  HUMIDITY
  26.                         CLASS       15251212
            DATE      062476
  24.        CORRELATION  COEFFICIENT =-.3226
            95 PERCENT CONFIDENCE  INTERUAL  =  (-.6366,  .0832)
  22.

  18.
                                  X   X
  16.
                              x                x
                              *     x
                             x^              x
                           x                  x
                              x     x*  x  x
                                    X
                                                                                                 w
                                                                                                 I
S                              x   x       x
g
^ 10.                                     x
I                                       xx
  8.   50.     55.     £0.     65.    70.    75.    80.    85.    90.    95.     100.
x     «"  RELATIUE HUniDITY (PERCENT)

-------
2e_                           GM  FUEL ECONOriY STUDY
                             MPG UERSUS  PRECIPITATION

          DATE       062476
          CORRELATION COEFf
          95  PERCENT CONFIDENCE  INTERUAL =  (-.2264, .5409)
 2B_                          CLASS        15251212
 24.        CORRELATION COEFFICIENT  -  .1854
 22.

 20.

 18.

 16.

 14.   X
          X
S 12.      **<
5
a
S
u. i o.
C3

 8'   20.    40.    60.    80.     100.    120.    140.    ISO.    180.    200.    220.
     "'  PRECIPITATION  C Mil)


x X

X
X X
*$• x
X

X


                                                                                                   Ul
                                                                                                   c»

-------
  28.
  26.
  24.
  22.
  20.
  18.
                   GM  FUEL ECONOMY  STUDY

                   MRG UERSUS TEMPERATURE

                   CLASS        15251212

 DATE      062476

 CORRELATION  COEFFICIENT =  .4423

 95  PERCENT CONFIDENCE  INTERUAL = <  =0572,  .7129)
                                                                                                   w
                                                                                                   I
                                                                                                   Ul
                                                   x  *
  16.
  14.
  12.
o

-------
  28.                           GM FUEL  ECONOMY STUDY
                              MPG UERSUS MILES  PER DAY
  2S.                           CLASS        15251212
            DATE       062476
  24.         CORRELATION COEFFICIENT = .7334
            95 PERCENT CONFIDENCE  INTERUAL =  <  .4763,  .8750)
  22.
  20.
  18.
  IB.
                                                                  X

  ,4.                                    x                         X
                                 ^ S\.            «/                  r\
                      X        XX              X
                               X
  12.             X       X X     X    X
g                  XX
°
5
a
                                                                                                     w
                                                                                                     &
                                                                                                     o
           x        x
g          x        x
"• to.
u                                    w
fc             x                      x
                                                70.    80.    90.    100.
  8'   0.     10.     20.     30.     40.     50.    SO.'
         MILES PER  DAY

-------
  52.                           GM FUEL  ECONOMY STUDY
                              MPG UERSUS POPULATION
  48.                           CLASS        23000313
            DATE       062476
  44.         CORRELATION COEFFICIENT =-.2671
            95 PERCENT CONFIDENCE  INTERUAL  =  (-.5551, .0782)
  40.
  36.
  32.
  28.
                                                                  X
  24.                                                               X
      X
      X

-------
  r-1?.                           Gf>  FUEL ECONOMY  STUDY
                              MPG UERSUS ZIP CODE
                              CLASS       23000313
            DATE      062476
  „„.         CORRELATION  COEFFICIENT =-.2870
            95 PERCENT CONFIDENCE  INTERUAL =  (-.5699,  .0567)
  40.
  32.
  28.
  24.   X
     X
£    X
° 20.  X     X
S          v
5    x     x
                                   x
                                                                                                  tfl
g          x                             x
u- 16.
  '2-  A.      i.     i     i     4.     4.     4.     ?.     &.     4.     !o.
     -   ZIP CODE (FIRST  DIGIT)

-------
  52.                          GM FUEL ECONOMY STUDY
                              MPG UERSUS  TERRAIN  INDEX
  48.                          CLASS        23000313
            DATE       062476
  44.        CORRELATION COEFFICIENT  -  .2354
            95 PERCENT CONFIDENCE  INTERUAL = <-.1116.  .5313)
  40.
  36.
  32.
  28.
  24.
0                                      X
  2Q.                    S              x
         x                              x
g        x
^ 1S-
                                                                                                   td
                                                                                                    uo
  12-   .'SO X   1.2    1.6    2.     2.4    2.8    3.2    3.6    4.     4.4    4.8
      •«   TERRAIN  INDEX

-------
  •3?.                            GM FUEL ECONOMY STUDY
                               MPG UERSUS ELEUATION
  48.                            CLASS        23000313
            DATE        062476
  44.         CORRELATION  COEFFICIENT =-.1587
            95  PERCENT CONFIDENCE  I NTERUAL = (-.4715,  .1897)
  40.
  36.
  32.
  20.
  24.
**
      1      I      I       IX     I      I      I      I       I      I      I
      0.     400.    800.    1200.   1600.   2000.   2400.   2800.   3200.   3600.   4000.
      -  ELEUATION C FT)

-------
  52.                          CM FUEL  ECONOMY STUDY
                              MPG UERSUS RELATIUE HUMIDITY
  48.                          CLASS        23000313
            DATE       062476
  44.        CORRELATION COEFFICIENT = .2165
            95 PERCENT CONFIDENCE  INTERUAL = (-.1313.  .5168)
  40.
  36.
  32.
  28.
  24.                            X
                                X
                              X
S     x                        x           x x
O
                                                                                                    tfl
  20.                   v         X
o                       •*• >
s                        *                 x x
g     x               x   S    xx     x    x
LL 16.
C3     v                             X
D-     X
      50.     55.    60.    65.    70.    75.    80.    85.    90.    95.    100.
      '-  RELATIUE HUMIDITY  (PERCENT)

-------
                              GM FUEL  ECONOMY STUDY
                              nPG UERSUS PRECIPITATION
  48.                           CLASS        23000313
            DATE       062476
  44.         CORRELATION COEFFICIENT = .1785
            95 PERCENT CONFIDENCE  INTERUAL =  <-. 1 699. .4872)
  40.
  36.
  32.
                                                                                                     W
                                                                                                     i
                                                                                                     O
                                             X
  24.                                      X
g         x     x                   x     x
° 20.               x            x  x X                  x
5           x           x               w    x
S                  x             x        x
£     x                  x    x     * x    x   *
u- 16.
?                       x    x                    X
fc                       X
  12>   0.      20.     40.     60.     80.    100.    120.    140.    160.    180.    200.
      "  PRECIPITATION (MM)

-------
  52.
  48.
  44.
  40.
                              GM FUEL ECONOMY STUDY
                              MPG UERSUS  TEMPERATURE
                              CLASS        23000313
            DATE       062476
            CORRELATION  COEFFICIENT  =  .1060
            95 PERCENT CONFIDENCE  I NTERUAL - (-.2408,  =4288)
  36.
                                                                                                   W
  32.
  28.
  24.
5
S
g
C3
D_
  20.
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      4_
4^
                        8.
                              12.
         TEMPERATURE C DEG C)
                                            X   x
                                       xxxxx
                                    16.
                                          20.
                                                24.
                                                      28.
                                                           32.
36.

-------
                             GM  FUEL ECONOMY  STUDY
                             MPG UERSUS MILES PER DAY
 48.                          GLASS       23000313
            DATE      062476
 44.         CORRELATION COEFE I C I ENT = .2117
            95  PERCENT CONFIDENCE INTERUAL  = (-.1362,  .5131)
  36.
                            X
                             X
S20.            x   *   x *  *
5              x      x, x*
5                     x    xx
8        *>S< x  *  X  x   x
^ 16.
ff            x  x
                      X
                                                                                                  a
                                                                                                  i
                                                                                                  o
                                                                                                  00
  l2'   0.      10.    20.    30.    40.    50.    60.    70.   * 80.    90.    100.
      '"   HILES PER DAY

-------
  52.
  48.
  44.
  40.
                  GM FUEL  ECONOMY STUDY
                  MPG UERSUS POPULATION
                  CLASS        23000323
DATE       062476
CORRELATION COEFFICIENT =-.1868
95 PERCENT CONFIDENCE  INTERUAL  =  <-. 5419.  .2249)
  36.
                                                                                                  td
  32.
  28.
  24.
                                                      X
                                                      X
ot

-------
 5.?.                           GM  FUEL ECONOMY STUDY
                              MPG UERSUS  ZIP  CODE
 4B.                           CLASS        23000323
           DATE      062476
 4«.        CORRELATION  COEFFICIENT =-.5611
           95  PERCENT CONFIDENCE  I NTERUAL - (. -. 7827, -. 21 33)
 40.
 36.
 32.
  28.
  ->x  X                                                     X
                             5tf                 X
                                                           X
     x                             x                 x     *
  20.
5
0 20.
g
"•
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                                                                                                  o
  12-  A.      !.     i.     3.     i.     4.      G.     ^.     a     4.     lo.
     "ZIP CODE (FIRST  DIGIT)

-------
  52.                          GM FUEL ECONOMY STUDY
                              MPG UERSUS  TERRAIN  INDEX
  48.                          CLASS        23000323
            DATE       062476
  44.        CORRELATION COEFFICIENT  =-.1183
            95 PERCENT CONFIDENCE  INTERUAL = (-.4905,  .2904)
  40.
  3S.
  32.
  28.
  24'  x                             S                             *.
                                                                 X
«     x                             8
° 20-
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8                                   x                             *
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I     X

  12-  !.     |.2    !.4    |.e    l.a    i     2.2    2.4    2.6    2.8   3.
x     -   TERRAIN  INDEX
                                                                                                  W
                                                                                                  I

-------
 52.                            GM FUEL  ECONOMY  STUDY
                               MPG UERSUS ELEUATION
 48.                            CLASS        23000323
            DATE       062476
 44.         CORRELATION COEFFICIENT =-.1132
            95 PERCENT CONFIDENCE  INTERUAL  = (-.4866.  .2951)
 40.
  3F,.
  3"1
  j..    x
  28.
      X
               X
  24-   X       XX  v
              X XX
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El
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5           x
LU
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C3                .,
fc                X

  12>  0.     500.    1000.   1500.   2000.   2500.   3000.   3500.   4000.   4500.   5000.
X     '"  ELEUATION (FT)

-------
  52.                           GM FUEL ECONOMY STUDY
                              MPG UERSUS  RELATIUE HUMIDITY
  48.                           CLASS        23000323
            DATE       062476
  44.         CORRELATION  COEFFICIENT  =  .1718
            95 PERCENT CONFIDENCE  INTERUAL = <-.2396.  .5309)
  40.
  36.
  32.
                                            X
  28.
                                     X
                                    X

  24-                      X X     xx          X

i     X       x           x    x                x

5  "   $       x           x
      I      I      I
      50.     55.    60.    65.    70.    75.    80.    85.     90.     95.     100.
                                                                                                   td
                                                                                                   i
                                                                                                   -vl
                                                                                                   UJ
      -  RELATIUE  HUMIDITY

-------
                              CM FUEL  ECONOMY  STUDY
                              MPG UERSUS PRECIPITATION
 48.                           CLASS        23000323
            DATE       062476
 4«.         CORRELATION COEFFICIENT = .3684
            95 PERCENT CONFIDENCE  INTERUAL  =  <-. 0313.  .6665)
 40.
  36.
  32.
  28.
                         X
                        X
  24                             *              X
  24"                    K     x
     X  •
a    *         X       x            x                    x
0 20.        X
UJ
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i*- 16.               x
fc       X

  12'  i.     20.     40.    60.     80.    100.    120.   140.   160.   180.   200.
*     «  PRECIPITATION 
-------
  52.                          GH FUEL ECONOMY  STUDY


                              MPG UERSUS TEMPERATURE


  48.                          CLASS        23000323


            DATE       062476


  44.        CORRELATION COEFFICIENT - .5751


            95 PERCENT CONFIDENCE  I NTERUAL  = <  . 2329,  .7906)


  40.





  36.

                                                                                                   tfl
                                                                                                   i
                                                                                                   -vl
                                                                                                   01

  32.
  28.
  24.                    v             X
                                               X
                                             X
o
  20.
UJ

Q/                          X
o
u- 16.                x


£       X
  12. _g.    _4_     (J).     4.     8.     12.    16.    20.    24.    28.    32.

x     ,,  TEMPERATURE (DEC  C)

-------
 ,)A                           GM FUEL  ECONOMY STUDY

                              MPG UERSUS MILES PER DAY
 4B.                           CLASS        23000323
            DATE       062476
 „,,.         CORRELATION  COEFFICIENT = .5768

            95 PERCENT CONFIDENCE  INTERUAL =  <  .2353.  .7915)

 40.
  3?.
  28.
                                   X
                                     X

  -'"'•              X v         X                                    X
                   X         x    X
                  X
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  20.
5                    x   x            x
ai
8                  x
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a           X


  1 •>   I      I      I      I      I      I      I      I      I      '       I
  '*•   0.     10.     20.     30.    40.     50.    60.    70.    80.    90.     100.
      •»  niLES PER DAY

-------
  26.                           GM FUEL ECONOMY STUDY
                              MPG UERSUS POPULATION
  24.                           CLASS        24000911
            DATE       062476
  22.         CORRELATION  COEFFICIENT =-.1326
            95 PERCENT CONFIDENCE  INTERUAL =  (-.4016,  .1574)

  20.
18.
     X  X

    X
16.
            x    x  x                    x              xx

      xX          x                              x               X
14.                                                              *
                          x                                     5
      X

12.     x    *                  X        X                        1
ex.

-------
                             GM FUEL ECONOMY STUDY
                             hPG UERSUS  ZIP  CODE
 24.                          CLASS        24000911
           DATE       062476
 22.        CORRELATION COEFFICIENT  =  .2531
           95 PERCENT CONFIDENCE  INTERUAL = (-.0335,  .5012)
 20.
  16.
  14.
           X
           x
  '2-  X     *     X     X     *                 *
                             X                 v
*          X                                  x
  i n.                          i^
5                            x

-------
  26.
  24.
  22.
  20.
                             GM  FUEL ECONOMY  STUDY

                             MPG UERSUS TERRAIN  INDEX

                             GLASS       24000911

            DATE      062476

            CORRELATION COEFFICIENT =  .1110

            95 PERCENT CONFIDENCE  INTERUAL = (-.1788, .3830)
  18.
  16.
  14.
  12.

-------
 26.                           GM FUEL  ECONOMY STUDY
                              MPG UERSUS ELEUATION
 24.                           CLASS        24000911
           DATE      062476
 22.        CORRELATION  COEFFICIENT  = .1378
           95  PERCENT CONFIDENCE  INTERUAL =  (-.1523, .4060)
 20.
 18.
             x                                  x                                                    W
                X
  IB.

     **    $  **  X
  14.  X       x X X
                   ^
              X
  )2.  &  x Xx^

a          xxx
5

-------
  26.                          GH FUEL  ECONOMY STUDY


                              MPG UERSUS RELATIUE  HUMIDITY


  24.                          CLASS        24000911


            DATE       062476


  22.        CORRELATION COEFFICIENT =-.3573


            95 PERCENT CONFIDENCE  INTERUAL =  (-.5823,-. 081


  20.
  18.
  1B.
      X
                                                                                                     w
                           x                                                                         oo
                     X    .-  X  X.,  x        X
                          XX

                                x£        x
                         X v      ^   *s
  14.                       AX

          W

                        X
                               X



  12.                    X XX   xXx    Xx   X **




                                X   X


-------
 26.                          CM  FUEL ECONOMY  STUDY
                             MPG  UERSUS PRECIPITATION
                             CLASS        24000911
           DATE       062476
 22.        CORRELATION COEFFICIENT =-.1518
           95  PERCENT CONFIDENCE INTERUAL  = (-.4179. .1383)
 20.
  18.
                                      X

        X     X x *    x  x    x   x   *          x    ^
                         x     **   **    **
          x                          xx
                                        X
  12.       X               X   ^  X  X
                X
o

-------
  2B.                           CM FUEL ECONOMY STUDY
                              MPG UERSUS  TEMPERATURE
  24.                           CLASS        24000311
            DATE       062476
  22.         CORRELATION  COEFFICIENT  =  .3960
            95 PERCENT CONFIDENCE  INTERUAL = (  .1261.  .6114)
  20.
  18.
                                     x     x X   x< v x
                                                  *  x
                                                  v
                                                                                                    tfl
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  12.    X       * X    X      X        XXX       x      X

K              X                 XX
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  10.            v
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CK
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LL 8.
CD
CL

  6.  _^    J4_     0.     4.     8.     12.    16.    20.    24.    28.    32.
x     "»  TEMPERATURE ( DEC C)

-------
  26.
  24.
                            GM FUEL ECONOMY STUDY
                            MPG UERSUS  MILES PER DAY
                            CLASS        24000911
          DATE       062476
          CORRELATION  COEFFICIENT  =  .5308
          95 PERCENT CONFIDENCE  INTERUAL = <  .2905, .7082)
  20.
  IB.
  12.
' Ni
<

X
X
X X x
x x
X

X
X


                                                                                                   w
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0.     10.
                 20.
                     30.
                            40.
      '"  MILES PER DAY
50.
                                                70.
                                                    80.
90.
                              100.

-------
  28.                           GM FUEL ECONOMY  STUDY


                              MPG  UERSUS POPULATION


  26.                           CLASS        24500911


            DATE       062476


  24.         CORRELATION COEFFICIENT =-.5436


            35 PERCENT CONFIDENCE INTERUAL = <-.7237,-. 2942)


  22.
  20.
  18.     x

      X

      X

  16.   XX^     X


      *x xx    x       x
      x                                                            x


  14-

      *      x                                                    2
a;            ^                                                    «

-------
?n.                          GM FUEL ECONOMY  STUDY


                            MPG UERSUS ZIP CODE


7*.                          CLASS       24500911


          DATE       062476


24.        CORRELATION  COEFFICIENT =-.0377


          95 PERCENT CONFIDENCE  INTERUAL =  <-.3309, .2621)



22.






20.

                                                                                                W
                                                                                                i
                                                                                                00
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18.        v

IS.


1 4.


tt
   0.     I.     2.      3.     4.     5.     6..    7.     8.     9.     10.

    -  ZIP CODE (FIRST  DIGIT)

-------
  28.                           GM FUEL ECONOMY  STUDY

                              hPG UERSUS TERRAIN INDEX

  26.                           CLASS        24500911

            DATE      062476

  24.         CORRELATION  COEFFICIENT  =  .1825

            95 PERCENT CONFIDENCE  INTERUAL = <-. 1209.  =4548)

  22.
  20.
  18.                                   X

         X


  is.      x               x


         *               *              x              x
         x               x
  14.                     X
         X               X
         /\               O


-------

24.
  22.
  20.
  18.
                              GM  FUEL ECONOMY STUDY
                              MPG UERSUS ELEUATION '
                              CLASS       24500911
            DATE       062476
            CORRELATION COEFFICIENT -  .4792
            95 PERCENT CONFIDENCE I NTERUAL = < .2126.  .6794)
                         X
                      X
                   X  X
                                                                                                     w
                                                                                                     I
                                                                                                     00
                                                                                                     00
  H.
5

-------
  28.                           CM FUEL  ECONOMY STUDY
                              MPG UERSUS RELATIUE  HUMIDITY
  26.                           CLASS        24500911
            DATE       062476
  24.         CORRELATION COEFFICIENT =-.0001
            95 PERCENT CONFIDENCE  INTERUAL  =  (-.2970,  .2968)
  22.
  20.
  18.                                  X
                                          X
  14.
                                                                                                   W
                                                                                                   i
                                                                                                   oo
                                                                                                   -o
                                    X
  16.                X             X
                                      X
                               X X    >
-------
 28.                          GM  FUEL ECONOMY  STUDY
                             MPG UERSUS PRECIPITATION
 26.                          CLASS       24500911
           DATE       062476
 24.        CORRELATION COEFFICIENT =  .0627
           95  PERCENT CONFIDENCE  INTERUAL = (-.2386,  . 353Q)
 20.
 18.                        X
                                      X

 ,6.     X                  X
                               \/                   y
              V                 As/           f     ***   vx
              x                 x   Xx        x x       x
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 R   I      I      I      I      I      I      I X    I       I      I      I
 "•   0.     20.    40.    60.    80.    100.   120.   140.    160.    180.    200.
X    "'  PRECIPITATION (MM)
Of
I 12-
o
a
LU
&
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^ 10.
o
£
X
X
x x
x

X




-------
28.                         GM FUEL  ECONOMY STUDY
                           MPG  UERSUS TEMPERATURE
26.                         CLASS        24500911
          DATE      062476
24.        CORRELATION COEFFICIENT =-.0558
          95 PERCENT CONFIDENCE INTERUAL - (-.3469,  .2452)
22.
20.
18.
16. X
X

14.
Of.
o
o
o x
^s 0^
X
x x xx

Xv/
X
X



1 1 i X I 1
4. 8. 12. 16. 20.
r— K/I n r~ n /N T i inil~ / PICO ON
                                                                                               W
                                       I      I      I      I     I
                                       24.    28.     32.     36.    40.

-------
  7R.                           GM FUEL ECONOMY STUDY
                              MPG UERSUS  MILES PER DAY
                              CLASS        24500911
            DATE      062476
  24.         CORRELATION  CDEFF I C I ENT  =  .5708
            95 PERCENT CONFIDENCE  INTERUAL = C  .3298.  .7419)
  20.
  1R                                         XXX
  16.                                                               x
               x x            xx             x          *
                        x      x   "
  1 4.                                              X
                    x                   x
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fc
           >S      I     I       I      I      I      I      I      I      I
            10.     20.    30.     40.     50.     60.     70.     80.     90.     100.
      '" MILES PER DAY

-------
  28.
  26.
  24.
  22.
  20.
  18.
                        GM FUEL ECONOMY STUDY

                        MPG UERSUS  POPULATION

                        CLASS        24501211

      DATE      062476


      CORRELATION  COEFFICIENT  =-.0175


      95 PERCENT CONFIDENCE  INTERUAL = <-.2972,  .2650)
                                                                                                    w
                                                                                                    I
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  16.
  14.
       X x


       X
                                                            X

                                                            X

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-------
 28.                          GM FUEL ECONOMY STUDY


                             MPG UERSUS ZIP CODE


 7R.                          CLASS        24501211


           DATE       062476


 24.        CORRELATION COEFFICIENT = .1354


           95  PERCENT CONFIDENCE  INTERUAL = <-. 1516.  .4013)


 22.




 20.


                                                                                                  r


 18.




 16.                    X


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X    -ZIP CODE CFIRST DIGIT)

-------
  2B.                           GM  FUEL ECONOMY  STUDY
                              MPG UERSUS TERRAIN INDEX
  26.                           CLASS       24501211
            DATE      062476
  24.         CORRELATION  COEFFICIENT =  .0583
            95 PERCENT CONFIDENCE  INTERUAL = (-.2267,  .3340)
  22.
  20.
  18.
  16.
  14.      X               X              X
         XX               X              X
o
re  "
CK
£ 10.
CD
Q.
                                                                                                   w
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                                                                                                   Ul
X
8-   .'80    1.2    1.6    2.     2.4    2.8    3.2    3.6    4.     4.4   4.8
        TERRAIN INDEX

-------
  2e_                          GM  FUEL ECONOMY STUDY
                             MPG UERSUS ELEUATION
  26_                          CLASS        24501211
           DATE       062476
  24.        CORRELATION COEFFICIENT = .0450
           95  PERCENT CONFIDENCE INTERUAL  =  <-.2392, .3221)
  22.
  70.
  18.
  16.          X
                 Xx             X
                       X
       X
  14.   X       X        XX
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a         x      x
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$                               x
  0-   o.     200.    400.   600.   800.   1000.   1200.   1400.   1600.   1800.   2000.
*    »  ELEUATION (FT)
                                                                                                   W
                                                                                                   i
                                                                                                   NO

-------
  28.                          GM FUEL  ECONOMY STUDY
                             MPG UERSUS  RELATIUE HUMIDITY
  26.                          CLASS        24501211
           DATE       062476
  24.        CORRELATION COEFFICIENT =-. 2832
           95  PERCENT CONFIDENCE  INTERUAL = <-.5228, -.0022)
  22.
  20.
  18.
                                  X
  16.
                        x  x          x
                                        X
                              x  x" x
                         x    x   X x*  x
C£                     X  X    X     A     X
S 12.                        X  X*  XX^X      x
g                            x x   x« x

-------
7H.
26.
24.
22.
                            CM  FUEL ECONOMY  STUDY
                            MPG UERSUS PRECIPITATION
                            CLASS       24501211
          DATE       062476
          CORRELATION COEFFICIENT =-.0319
          95 PERCENT CONFIDENCE I NTERUAL = <-. 3103.  .2515)
20.
18.
                                                                                                  W
                                                                                                  I
                                                                                                  vO
                                                                                                  00
16.
14.  X      X
     X
tt
Q
5

-------
  28.                           GM FUEL  ECONOMY STUDY
                              MPG UERSUS  TEMPERATURE
  26.                           CLASS        24501211
            DATE       062476
  24.         CORRELATION  COEFFICIENT - .0564
            95 PERCENT CONFIDENCE  INTERUAL =  <-.2284, =3323)
  22.
  20.
  18.
  16.
  14.            X                    >X         X
               X              X      X
               X     X              X X X><
g          x             x         x x x
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ca                                    v
CL                                    X

  8.   ^     J,.     8.     12.    16.    20.    24.    28.    32.    36.    40.
                                                                                                    W
                                                                                                    i
      «•  TEMPERATURE C DEG  C)

-------
  7R.                           CM  FUEL ECONOMY  STUDY
                              MPG UERSUS fllLES PER DAY
  26.                           CLASS        24501211
            DATE       062476
  74.         CORRELATION COEFFICIENT -  .6757
            95 PERCENT CONFIDENCE INTERUAL = < .4870,  .8041)
  77.
  20.
  I 8.
  16.
  14.             XX           X             XX
                                        X     x   x
                       "> ^ *•  "X
             X          ^ ^*                    ^
                  x     x                     x
  12.
a                x      x
!io-           x   x   Xx
&            X
  p    I      I      I      I      I      I      I      I       I      I      I
  °-    0.      10.    20.     30.     40.    50.    60.    70.     80.     90.     100.
X     "'  P1ILES PER DAY

X
X X

Xv
s\
w X
vs. x X
xx x^Sfc x v.
X


X
xx

^x x
X
V
X

X





                                                                                                     O
                                                                                                     o

-------
  28.                           GM FUEL ECONOMY STUDY
                              MPG UERSUS  POPULATION
  26.                           CLASS        25251111
            DATE      062476
  24.         CORRELATION  COEFFICIENT  =-.5582
            95 PERCENT CONFIDENCE  INTERUAL = (-.7516,-.2764)
  22.
  20.
  18.
  16.
         X
                                                                 X
        x                                                        x
  — *                 x                             x*
                                                                 X
                                                       X
                                                     X
                       x                                         x
~x
X
&.

-------
  28.                          GM FUEL  ECONOMY STUDY
                             MPG  UERSUS ZIP CODE
  26.                          CLASS        25251111
           DATE      062476
  24.        CORRELATION COEFFICIENT = .3980
           95  PERCENT CONFIDENCE INTERUAL =  <  .0746.  .6456)
  22.
  20.
  18.
  IB.
  14.              X
     X           X                 $
«          x           *     S
" 12.        X                 X
5          X                 *                             X
5          x                       *
     V     *
g    5     x                 X
u. 10.
o          8
t          X
  8-  A.     i.     2.     4.     i.     4.     4.     ^.     k     4.     lo.
X    »  ZIP  CODE (FIRST  DIGIT)
                                                                                                  to
                                                                                                  o
                                                                                                  N

-------
  28.                           GM  FUEL ECONOMY  STUDY


                              MPG UERSUS TERRAIN INDEX


  26.                           CLASS       25251111


            DATE      062476


  24.         CORRELATION  COEFFICIENT =-.4285


            95 PERCENT CONFIDENCE  NTERUAL = <-. 6665.-. 1 1 1 1


  22.
  20.
  18.
  16.
  14.
§        x

-------
 „.                           GM FUEL  ECONOMY  STUDY

                              MPG UERSUS ELEUATION

                              CLASS        25251111

            DATE       062476

 24.         CORRELATION COEFFICIENT =-.0976

            95 PERCENT CONFIDENCE  INTERUAL  = (-.4173.  .2436)

 22.
 20.
  18.



  1 P..
                                   X
       X
            x             x
                            \/-   y
                 v/          A,   ^        *S
                 x     x                 x
      x                              X
g          x              v         x
0 12              X              X               X
5       x              xx          x
ff                          x
u                            x
a     'v,                          v
S .o.    *                    x     x
                            x             x
&     X                     X


  e-    Q.      200.    400.    600.    800.    1000.   1200.   1400.    1600.   1800.   2000.

X     « ELEUATION  < FT)

-------
  28.                           GM FUEL ECONOMY  STUDY
                              MPG UERSUS RELATIUE HUMIDITY
  26.                           CLASS        25251111
            DATE      062476
  24.         CORRELATION  COEFFICIENT =  .0771
            95 PERCENT CONFIDENCE  INTERUAL = (-.2629,  .4000)
  22.
  20.
                               X
                        X
                                  X   X
  14.                              X    Xx
                                   XV  Q *•
                                      *s
                                  xx
tt!                                      ^ X

-------
  28.                           GM FUEL ECONOMY  STUDY
                              hPG  UERSUS PRECIPITATION
  26.                           CLASS        25251111
            DATE       062476
  24.         CORRELATION COEFFICIENT = .2188
            95 PERCENT CONFIDENCE INTERUAL = (-.1234,  .5146)
  27.
  20.
  18.
  16.
                             X
                              X
                   X     X
  14.                ^        X
                    X^     x
                          'x            x
&              >e<
g                           x
  12.               *C  X
5        x         x x x         x
uj                    \S
O                 X  v    X
u- 10.                  *
C                    XX
  R    I      I      I      I      I      I      I      I      I       I      I
  °'    0.      40.     80.     120.    ISO.    200.    240.   280.   320.    360.    400.
X     -   PRECIPITATION  (MM)
                                                                                                     W
                                                                                                     i

-------
  2B.                           GM FUEL ECONOMY STUDY
                              MPG UERSUS  TEMPERATURE
  26.                           CLASS        25251111
            DATE       062476
  24.       ,  CORRELATION  COEFFICIENT  =  .4985
            95 PERCENT CONFIDENCE  INTERUAL = (  .1981.  .7132)
  22.
  20.
  18.
  16.
                                             X
  14.                                      y
                       XX            $ X
                      X
                    X      X
XX
                                                                                                   bd
                                                                                                   o
                                                                                                   -j
£        X   X                              X
° 12.       X                             X  X
5          x               x        x       x
§                                       X
u           X    v
&.                 v*                         X
S 10.        *     X
  8.  _4.     ^,.     4.     8.     12.    16.    20.    24.    28.     32.     36.
x     »  TEMPERATURE

-------
28.                          GM FUEL ECONOMY STUDY
                            MPG UERSUS  MILES PER DAY
26.                          CLASS        25251111
          DATE       062476
24.        CORRELATION COEFFICIENT  =  .5480
          95 PERCENT CONFIDENCE  INTERUAL = ( .2627,  .7452)
22.
20.
18.
16.
14.


«
a
0 12.
5
a
UJ
B
u- 10.
fe
8- o.
X
x xxx
X
v>
X
*x x
\f
x x
x
x * xx

x x
x x
1 1 1
10. 20. 30.
                          X
                           x   x
w
I
H*.
o
00
                                                               X
                                                               X
                            40.    50.    60.    70.    80.    90.    100.
       MILES PER  DAY

-------
  28.                           GM FUEL ECONOMY STUDY
                              MPG UERSUS  POPULATION
  26.                           CLASS        25251212
            DATE       062476
  24.         CORRELATION  COEFFICIENT  =-.3544
            95 PERCENT CONFIDENCE  INTERUAL = <-. 6751,  .0790)
  22.
  20.
  18.
  16.
  14.
        X

-------
 7M.                          GM FUEL  ECONOMY STUDY
                             MPG UERSUS ZIP CODE
 ?5.                          CLASS        25251212
           DATE       062476
 24.        CORRELATION COEFFICIENT - .4775
           95  PERCENT CONFIDENCE  INTERUAL = <  .0699.  :7484)
 22.
  20.
  18.
  16.
                             X
  14.
                             X
Sr          X     ^           ^     X
ox                 x
g    X     *     *
Ul          X
g ;„              *
""          X
fe
  p   I      f     I      1      1      I      1      1      I      I      I
  H>   0.     1.     2.     3.     4.     5.     6.     7.     8.     9.     10.
X    "ZIP  CODE CFIRST  DIGIT)

-------
  28.                          CM  FUEL ECONOMY STUDY
                             MPG UERSUS TERRAIN  INDEX
  26.                          CLASS       25251212
            DATE      062476
  24.         CORRELATION COEFFICIENT =-.1189
            95  PERCENT CONFIDENCE  INTERUAL  =  (-,5147, =3187)
  22.
  20.
  18.
  16.
  14.
  12.
5
S
  10.
o
D-
                                                                                                   td
  8.   .'80    !.2    1.6    2.     2.4    2.8   3.2    3.6    4.     4.4    4.8
          TERRAIN  INDEX

-------
  28.                            GM FUEL ECONOMY STUDY
                               MPG UERSUS  ELEUATION
  26.                            CLASS        25251212
            DATE       062476
  24.         CORRELATION COEFFICIENT  =  .1619
            95 PERCENT CONFIDENCE  INTERUAL =  < ~. 2788,  „5^62)
  22.
  20.
  18.
  IE.
                           X
  14.
                             X
       X               X   X
  12.
  1 *•     A-f V
5     xx **
flC
UJ
g
  to.
C9
*      tt
                         X
                             X
                       XI
                         800.    10QO.   1200.   1400.   1600.   1800.   2000.
"'  ELEUATION (FT)
  g!      I      I      II      I      I      I      I       I      I
  °'   0.     200.    400.    BOO.

-------
  28.                          GM FUEL  ECONOMY STUDY
                              MPG UERSUS RELATIUE  HUMIDITY
  26.                          CLASS        25251212
            DATE       062476
  24.        CORRELATION COEFFICIENT = .0801
            95 PERCENT CONFIDENCE  INTERUAL  =  C-.3535, .4853)
  22.
  20.
  18.
  16.
  14.
I 12'
o

-------
 28.                          GM  FUEL ECONOMY  STUDY
                             MPG UERSUS PRECIPITATION
 26.                          CLASS       25251212
           DATE       062476
 24.        CORRELATION COEFFICIENT =-.1840
           95  PERCENT CONFIDENCE INTERUAL  =  <-.5620.  .2576)
 22.
 20.
 18.
  16.
  14.

a X
cr
° 12.
5
5 3ss"
fc
u. 10.

E
X
x*'
x ^ X
X
x

X
X
                              XL
 81   0.     40.    80.    120.   160.   200.   240.   280.   320.   360.   400.
X    «  PRECIPITATION (MM)

-------
  28.                          GM  FUEL ECONOMY STUDY
                             MPG UERSUS TEMPERATURE
  26.                          CLASS       25251212
            DATE      062476
  24.         CORRELATION COEFFICIENT =  .3207
            95  PERCENT CONFIDENCE  INTERUAL  =  (-.1167, .6539)
                                     •
  22.
  20.
  18.
  16.
                                                 X
  14.
                                                     X
«          x           xx                       x
o              X  x
E              *      xx   »
S                                              x *
g                          x
^ 10-
                                                                                                 td
                                                                                                 i
  8.  _^_    -4_     Q.     4.     8.      12.     16.    20.    24.    28.    32.
x
         TEMPERATURE  (DEC C)

-------
  28.                           CM FUEL ECONOMY  STUDY


                              MPG UERSUS MILES PER DAY


  26.                           CLASS        25251212


            DATE       062476


  24.         CORRELATION COEFFICIENT = .7169


            95 PERCENT CONFIDENCE  INTERUAL  - ( .4232,  .8743)



  22.






  20.

                                                                                                   W
                                                                                                   l
                                                                                                   !-»•
                                                                                                   H*

  IB.                                                                                                <*"






  16.





                                                                  X
  14.

                                              X


%                      x         X      X X     x
o                                  X               X
"12.               xx
S            X      x              X

S                       XX


8                   x
"- 10.





  ft    1   X   i      i      i      i      i      i       i     i       i      i
  °'    0.      10.     20.    30.     40.    50.    60.    70.    80.     90.     100.

X     -   MILES PER  DAY

-------
  30.                           GM FUEL ECONOMY STUDY
                              MPG UERSUS  POPULATION
  28.                           CLASS        34000711
            DATE       062476
  26.         CORRELATION  COEFFICIENT  =-.3975
            95 PERCENT CONFIDENCE  INTERUAL = (-.6628,-.0434)
  24.
  22.
  20.
                         X                                       X
       X
  18.                                                              x
               X
      x  x
  16-   x                                                          $
      Xx                             *                         x  x
      *                                                          X
  14.                    X
o
u- 12.
                                                                  x
  10.   ^     JO.    20.    30.    40.    50.    60.    70.    80.     90.     100.
x     -  POPULATION (THOUSANDS)

-------
 30.                          GM FUEL ECONOMY STUDY
                             MPG  UERSUS ZIP CODE
 7B.                          CLASS        34000711
           DATE      062476
 26.        CORRELATION COEFFICIENT =-.0806
           95  PERCENT CONFIDENCE INTERUAL =  (-.4284, .2880)
 24.

 22.

 20.
     x                             x
                                                           X
 18.              x
                             X
                 x     x
 16.
           y                 v*
     x           x                 x     x     x
8                                  x     x
                                                           x
  M-
S                      x                 x
g    x
"- 12.
  '°-  0.     I.     2.     3.     4.     5.     6.     7.     8.     9.     10.
     -  ZIP  CODE (FIRST  DIGIT)
                                                                                                 W
                                                                                                 00

-------
  30.                          GM  FUEL ECONOMY STUDY


                             MPG UERSUS TERRAIN  INDEX



  28.                          CLASS       34000711


            DATE      062476



  26.         CORRELATION COEFFICIENT =-.0322


            95 PERCENT CONFIDENCE  INTERUAL  =  (-.3879, .3320)



  24.






  22.






  20.



        X              *
                                                     X

  18.                    x
  16.





K                      X              X

-------
  30.                           GN  FUEL ECONOMY STUDY

                              MPG UERSUS  ELEUATION

  vp.                           CLASS        34000711

            DATE       062476

  26.         CORRELATION COEFFICIENT =  .0128

            95 PERCENT CONFIDENCE  INTERUAL = (-.3491,  .3714)

  24.
  22.
  20.


        X      X
             X
  18.        x

                  X

                  X
  16.
£'4-   *
S     *
g     X
^ 12.
  '°-   0.     400.    800.    1200.   1600.   2000.   2400.   2800.   3200.   3600.   4000.
X     -  ELEUATION  (FT)
                                                                                                    td
                                                                                                    I

-------
  30.                           GM FUEL ECONOMY STUDY


                              nPG UERSUS  RELATIUE HUMIDITY


  28.                           CLASS        34000711


            DATE       062476


  28.         CORRELATION  COEFFICIENT  -  .1116


            95 PERCENT CONFIDENCE  INTERUAL = (-.2590,  .4537)


  24.
  22.
  20.
                                    X

  18.                                   x



                                 X
                          x   S   x

                              §  *

K                                       XX


S M.                           X X            X
x                               ^ X


8                                     X   ><
LU                                     X

                              X
o
LL 12.

CD                              X
CL                                            X
c                        X                   x




  10-  50.     55.     60.    65.    70.    75.     80.     85.     90.     95.     100.


x     -  RELATIUE HUMIDITY (PERCENT)
                                                                                                   W

-------
  30.                           GM FUEL  ECONOMY STUDY
                              MPG UERSUS PRECIPITATION
  28.                           CLASS        3400071 1
            DATE       062476
  26.         CORRELATION COEFFICIENT =-.0855
            95 PERCENT CONFIDENCE  INTERUAL =  (-.4324,  .2835)
  24.
  22.
  20.
                      X                          X
            X
  18.                                                         x
                       X
                      x    x
  16.
                           x  x                              x
                  x xx     x       xx
g              x  x
5 M*                               x >^       x   x    x
UJ           X                                                X
g         X                                            x
"- 12.
a                                 x
fc                       x                 x
  10'  0.      20.    40.     60.     80.     100.    120.   140.    160.    180.   200.
X    -   PRECIPITATION (MM)
                                                                                                    tri
                                                                                                    N

-------
  30.                           GM FUEL  ECONOMY STUDY


                              MPG UERSUS  TEMPERATURE


  28.                           CLASS        34000711


            DATE       062476


  26.         CORRELATION COEFFICIENT - .0977


            95 PERCENT CONFIDENCE  INTERUAL - (-=2721,  =4424)


  24.
  22.
  20.





                                     X

  18.                                         X


                                             X


                     X                     X

  16.


                        X



                      x                   x x x    x
g                                        X  * *•


S        x                                         x
                                             \s  ^*
C£                                            X.
o
^- 12.

CD                                         X

£          x                              x



  „   I     -- I      I      I      I      I      I      I      I      I      I
  10.  _^     ^     4.     8.     12.    16.     20.    24.    28.    32.    36.
                                                                                                    w
                                                                                                    I
                                                                                                    H-*-
                                                                                                    CsJ
                                                                                                    LO
         TEMPERATURE (DEC C)

-------
30.                          CM FUEL  ECONOMY STUDY
                            MPG UERSUS MILES PER DAY
28.                          CLASS        34000711
          DATE       062476
2B.        CORRELATION COEFFICIENT = .5461
          95 PERCENT CONFIDENCE  INTERUAL  =  <  .2313. .7573)
24.


22.


20.

                  x            X
18.                          x
                            X
               X                 X
16.

tt
a
° 14.
5
Id
8
"- 12.
u
fc
~A X. x
X X
5 x x
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X X

X
vv xC
                                                                                                  w
                                                                                                  I
in   I      >      I      I      I      I      I      I      I      I      I
1U-   0.     10.     20.     30.     40.     50.     60.     70.     80.     90.     100.
    -  MILES PER DAY

-------
  30.                           GM FUEL  ECONOMY STUDY


                              MPG UERSUS  POPULATION


  28.                           CLASS        34501011


            DATE       062476


  26.         CORRELATION  COEFFICIENT  = .0192


            95 PERCENT CONFIDENCE  INTERUAL = (-.3160,  . 3502)


  24.





  22.

                                                                                                    w

                                                                                                    l-t-
                                                                                                    ro
  20.                                                                                                 ui





  18.   X



       X                                                          ^

  16.                          X                                     X

       X             *
      X                                                           X
I     XX   X
       X
a:
o
^ 12.

CD
CL
X
10.  ^     J0.    20.    30.    40.    50.    60.    70.    80.    90.    100.

    -  POPULATION (THOUSANDS)

-------
  30.                          en  FUEL ECONOMY  STUDY
                             MPG UERSUS ZIP CODE
  79.                          CLASS       34501011
            DATE      062476
  26.         CORRELATION COEFFICIENT =  .3412
            95 PERCENT CONFIDENCE  INTERUAL  =  <  .0090, .6056)
  24.
  22.
  20.
  ,8.                          X
                             O     X
  16.                          XX
                                                     S
                       xx
a                §     ¥     *                 X
° 14.              *           X
S                      fl           x     x
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g
L>- 12.
CD                      XI
                       X     x           *

  '°-  i.     !.     2.     I     i.     4.     6.   .  ^.     t     k     Ifl.
X    "ZIP  OODE (FIRST  DIGIT)
                                                                                                  w
                                                                                                  I

-------
  30.                           GM FUEL ECONOMY STUDY
                              UPC UERSUS  TERRAIN  INDEX
  28.                           CLASS        34501011
            DATE      062476
  26.         CORRELATION  COEFFICIENT  =-.3400
            95 PERCENT CONFIDENCE  INTERUAL = <-.6047,-.0076)
  24.
  22.
  20.
  18.
         X               \s
  16.      X
                        *
*        X               £               X              X
° 14.                     *               X
5        x               *
CT                       5?               X
                        X
a:
o
u- 12.
         X
         X
                                                                                                   IV
                                                                                                   -j
X
10.  .'80    ).2    1.6    2.     2.4    2.8    3.2    3.6    4.     4.4    4.8
        TERRAIN INDEX

-------
  30.                            Gfl FUEL  ECONOMY  STUDY
                               MPG UERSUS ELEUATION
  ?n.                            CLASS        34501011
            DATE       062476
  26.         CORRELATION  COEFFICIENT = .2441
            95  PERCENT CONFIDENCE  INTERUAL = (-.0970,  .5339)
  24.
  22.
  20.
  18.        X
  16.           X
                                                      X        X
"     X       x x     X

I"  *  *       *x  *
g
u- 12.
CD            •£
&     X       5fe
      X
  10*  0.     500.   1000.  1500.   2000.   2500.   3000.   3500.   4000.   4500.   5000.
X     -  ELEUATION (FT)
                                                                                                      00

-------
 ao.                          GM FUEL ECONOMY STUDY

                             MPG UERSUS RELATIUE  HUMIDITY

 28.                          CLASS        34501011

           DATE       062476

 26.        CORRELATION COEFFICIENT =-.1785

           95  PERCENT CONFIDENCE  INTERUAL =  (-.4830,  .1645)

 24.
 22.
 20.
  18.
                                   X     x
                          X               x
  16.                           XX

     S
                                  X x
                          S      yXv X
                          *•      X v * X
  14.                              X       X
S
                                 X

  10-   50     55.     SO.     65.    70,    75.    80.    85.    90.    95.    100.
X
         RELATIUE HUMIDITY (PERCENT)

-------
  30.                           GM  FUEL ECONOMY STUDY
                              NPG UERSUS PRECIPITATION
  28.                           CLASS        34501011
            DATE       062476
  26.         CORRELATION COEFFICIENT =-.0085
            95 PERCENT CONFIDENCE INTERUAL = (-.3408,  .3257)
  24.
  22.
  20.
  IS.
  15.
9f
° 14.
5
g
i*- 12.
W
i
I-*-
OJ
o
X *
X
X
X
X
x x
X
X

X

X

X

          X
          X
     0.      40.     80.     120.    160.    200.   240.   280.   320.   360.    400.
     -'   PRECIPITATION (MM)

-------
  30.                           CM FUEL ECONOMY STUDY
                              MPG UERSUS  TEMPERATURE
  28.                           CLASS        34501011
            DATE       062476
  26.         CORRELATION  COEFFICIENT  =  .3639
            95 PERCENT CONFIDENCE  INTERUAL - < .0349.  .6218)
  24.
  22.
  20.
  18.
                                      X
  IS.                                   X*
8,4.
5             x
               x
                                                                                                  td
x
             ,
             X                      X
                                    X
  ,r.   I      I      I      I      I      I      I      I      I      I      I
  10-  o.     4.     8.     12.    16.    20.     24.     28.     32.     36.     40.
      -  TEMPERATURE ( DEG C)

-------
  30.                           GM FUEL  ECONOMY STUDY
                              MPG UERSUS MILES  PER DAY
  28.                           CLASS        34501011
            DATE       062476
  26.         CORRELATION COEFFICIENT = .5010
            95 PERCENT CONFIDENCE  INTERUAL  = < .2014,  .7149)
  24.
  22.
  20.
  18.

                         xx      *
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X     -   MILES PER DAY

-------
  30.                            GM FUEL  ECONOMY  STUDY
                               MPG UERSUS POPULATION
  28.                            CLASS        35251012
            DATE       062476
  26.         CORRELATION COEFFICIENT  = .0826
            95 PERCENT CONFIDENCE  INTERUAL =  (-.1772,  .3317>
  24.
  22.
  20.
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    -  POPULATION  (THOUSANDS)

-------
  30.                           GM  FUEL ECONOMY  STUDY
                              MPG UERSUS ZIP CODE
  28.                           CLASS       35251012
            DATE      062476
  26.         CORRELATION  COEFFICIENT =  .1179
            95 PERCENT CONFIDENCE  INTERUAL -  (-.1425,  .3630)
  24.
  27.
  20.
                                                                                                   td
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X     "ZIP  CODE (FIRST  DIGIT)

-------
 30.
  28.
  2B.
  24.
  22.
  20.
                        GM FUEL ECONOMY  STUDY
                        MPG UERSUS  TERRAIN INDEX
                        CLASS        35251012
      DATE       062476
      CORRELATION  COEFFICIENT  --.0269
      95 PERCENT CONFIDENCE  INTERUAL = (-.2811.  .2307)
                                                                                                   CO
  18.
  16.
5

-------
24.
7.7.
                            GP1 FUEL  ECONOMY STUDY
                            nPG UERSUS ELEUATION
                            CLASS        35251012
          DATE       062476
          CORRELATION COEFFICIENT =-.0442
          95 PERCENT CONFIDENCE   NTERUAL = (-.2969,  .2143)
    X
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                      1200.   1600.   2000.   2400.   2800.   3200.   3600.   4000.
       ELEUATION  ( FT)

-------
 30.                          GM FUEL  ECONOMY STUDY
                             MPG UERSUS RELATIUE HUMIDITY
 28.                          CLASS        35251012
           DATE       062476
 26.        CORRELATION COEFFICIENT =-.1866
           95  PERCENT CONFIDENCE  INTERUAL =  (-.4225,  .0730)
 24.
 22.
 20.
  18.
  16.
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  10.   50     55.     60.     65.   X70.    75.  X 80.    85.    30.    95.    100.
      -"  RELATIUE  HUMIDITY (PERCENT)

-------
  30.                           GM FUEL ECONOMY  STUDY
                              flPG UERSUS PRECIPITATION
  ?9.                           CLASS        35251012
            DATE       062476
  26.         CORRELATION COEFFICIENT = .0597
            95 PERCENT CONFIDENCE  INTERUAL  =  (-.1994.  .3111)
  24.
  22.
  20.
  18.
  16.
  14.
5

-------
 so.                          GM  FUEL ECONOMY  STUDY
                             MPG UERSUS TEMPERATURE
 2S.                          CLASS       35251012
           DATE      062476
 26.        CORRELATION COEFFICIENT =  .3504
           95  PERCENT CONFIDENCE  INTERUAL  -  (  .1036,  .5565)
 24.
  22.
  20.
  18.
  16.
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A.     4. X   8.     12.    Is.    20*    k     k    32.    36.

-------
  28.
  26.
24.
2?.
20.
1 3.
                             GM  FUEL ECONOMY STUDY


                             flPG UERSUS  MILES PER DAY

                             CLASS        35251012

          DATE       062476

          CORRELATION COEFFICIENT  =  .4644


          95  PERCENT CONFIDENCE  I NTERUAL = <  .2365.  .6439)
                                                                                                   W
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-------
 2s.                           CM  FUEL ECONOMY  STUDY

                              MPG UERSUS POPULATION

 24.                           CLASS       35501411

            DATE      062476

 22.         CORRELATION  COEFFICIENT =-.3060

            95 PERCENT CONFIDENCE  INTERUAL = <-.5213,-.0542)

 20.
  16.      X                          X  X    X

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    ~  POPULATION (THOUSANDS)

-------
  26.                          GM  FUEL ECONOMY STUDY


                             MPG UERSUS ZIP CODE


  24.                          CLASS        35501411


            DATE      062476


  22.         CORRELATION COEFFICIENT = .1810


            95 PERCENT CONFIDENCE INTERUAL  =  (-.0788, .4177)


  20.
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-------
 26.                          GM  FUEL ECONOMY  STUDY
                             MPG UERSUS TERRAIN INDEX
 24.                          CLASS       35501411
            DATE      062476
 22.         CORRELAT I ON COEFF I C I ENT =  . 0 336
            95  PERCENT CONFIDENCE  INTERUAL = (-.2244,  .2872)
 20.
  18.
   -                                x
                                   X
  14.  *                             *
  12.

-------
  2B.                            GM FUEL  ECONOMY STUDY
                               MPG UERSUS ELEUATION
  24.                            CLASS        35501411
            DATE       062476
  22.         CORRELATION COEFFICIENT =-.0273
            95  PERCENT CONFIDENCE  INTERUAL =  (-.2814,  .2304)
  20.
  18.
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                                                                                                       td
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-------
 26.                           GM  FUEL ECONOMY STUDY
                              MPG UERSUS  RELATIUE HUMIDITY
 24.                           CLASS        35501411
            DATE      062476
 22.         CORRELATION  COEFFICIENT  =  .2294
            95  PERCENT CONFIDENCE  INTERUAL = <-.0283,  =4586)
 20.
  16.
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      50.
      «  RELATIUE  HUMIDITY (PERCENT)

-------
  26.                           GM  FUEL ECONOMY STUDY

                              MPG UERSUS PRECIPITATION

  24.                           CLASS        35501411

            DATE       062476

  22.         CORRELATION COEFFICIENT =  .2440

            95 PERCENT CONFIDENCE  I NTERUAL = (-.0129.  .4707)

  20.
  18.
  '6-                     XX<
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X     -  PRECIPITATION (MM)

-------
26.                          GM  FUEL ECONOMY  STUDY

                            MPG UERSUS TEMPERATURE

24.                          CLASS       35501411

          DATE       062476

22.        CORRELATION COEFFICIENT =  .1611

          95  PERCENT CONFIDENCE  INTERUAL = <-.0991.  .4006)


20.




18.




1G-                       x                 XX      x
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x     •»  TEMPERATURE (DEC  0)

-------
  7B.                            Gn FUEL ECONOMY STUDY

                               MPG UERSUS MILES PER DAY

  24.                            CLASS        35501411

            DATE       062476

  22.         CORRELATION COEFFICIENT  =  .5513

            95 PERCENT CONFIDENCE  INTERUAL =  <  .3437,  .7075)

  20.



  18.



  '6-                               X                    X             X                                    £
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X     •»  MILES PER DAY

-------
 26.                           GM FUEL ECONOMY STUDY

                              MPG UERSUS  POPULATION

 24.                           CLASS        35501412

            DATE       062476

 22.         CORRELATION  COEFFICIENT  =-. 1359

            95 PERCENT CONFIDENCE  INTERUAL = (-.3967,  .1451)

 20.
  18.
  16.
        X
       X
  14.

      xx x        x
      X  x     X
6.   b.     10.    20.    30.    40.    50.    60.    70.    80.
    -  POPULATION (THOUSANDS)
                                                                                                     vD
  '^-   x x     x                      xx                           I

        **£  x         x                X        x                  I
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0 10.                                                               X
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-------
  26.                          GM  FUEL  ECONOMY STUDY

                             MPG UERSUS ZIP CODE

  2<.                          CLASS        35501412

            DATE      062476

  22.         CORRELATION COEFFICIENT = .1705

            95  PERCENT CONFIDENCE I NTERUAL = (-.1103.  .4260)

  20.
  18.
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  16.

  '2-        x           x

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*     "ZIP  CODE (FIRST  DIGIT)
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-------
 26.                          GM  FUEL ECONOMY  STUDY

                             MPG UERSUS TERRAIN  INDEX

 24.                          CLASS       35501412

            DATE      062476

 22.         CORRELATION COEFFICIENT =-.0712

            95  PERCENT CONFIDENCE  INTERUAL  =  (-=3401, =2085)

 20.
  18.
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  14.     x
        X
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-------
  26.                            Gil FUEL  ECONOMY  STUDY


                               flPG UERSUS ELEUATION


  74.                            CLASS        35501412


            DATE       062476


  22.         CORRELATION  COEFFICIENT = .2631


            95 PERCENT CONFIDENCE  INTERUAL  =  <-. 0 1 35.  .5023)



  20.





  18.





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  6>   0.     500.   1000.   1500.   2000.  2500.   3000.   3500.   4000.   4500.   5000.

X     «  ELEUATION (FT)

-------
 26.                          GM  FUEL ECONOMY STUDY
                             MPG UERSUS RELATIUE  HUMIDITY
 24.                          CLASS        35501412
           DATE      062476
 22.        CORRELATION COEFFICIENT =-.0094
           95  PERCENT CONFIDENCE I NTERUAL  =  (-.2843, .2669)
 20.
  18.
  16.
                             X
                                  x

                                 x*    x*
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  6.   ^0.     ^5.     60.     65.     70.    ?5.    80.    85.    30.    95.    100.
x     -  RELATIUE  HUMIDITY (PERCENT)

-------
 26.                          GM FUEL  ECONOMY STUDY
                             MPG  UERSUS PRECIPITATION
 24.                          CLASS        35501412
           DATE       062476
 22.        CORRELATION COEFFICIENT =-.2320
           95  PERCENT CONFIDENCE  NTERUAL  =  (-.4771, .0465)
 20.
  18.
  16.
X x ™
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x    -  PRECIPITATION cnm
                                                                                                  W
                                                                                                  t

-------
 26.                          CM  FUEL ECONOMY  STUDY
                             hPG UERSUS TEMPERATURE
 24.                          CLASS       35501412
           DATE      062476
 22.        CORRELATION COEFFICIENT = .0273
           95  PERCENT CONFIDENCE  I NTERUAL =  <-. 2501.  .3006)
 20.
  18.
  16.
x
                        xx
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      -  TEMPERATURE  (DEC C)

-------
  7r>.                           GM FUEL  ECONOMY STUDY
                              MPG UERSUS MILES PER DAY
  2,.                           CLASS        35501412
            DATE       062476
  2?.         CORRELATION COEFF I C  ENT = .5439
            95 PERCENT CONFIDENCE  INTERUAL =  <  .3157, .7127)
  20.
  18.
  16.
                                  X
                                            x    x     x
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         MILES PER  DAY

-------
 26.                          GM  FUEL ECONOMY  STUDY


                             MPG UERSUS POPULATION


 24.                          CLASS       44500912


           DATE      062476


 22.        CORRELATION COEFFICIENT =-.1468


           95  PERCENT CONFIDENCE  INTERUAL = (-.4315,  .1644)



 20.






 18.




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 16.




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-------
  26.                          GM FUEL  ECONOMY STUDY
                             MPG UERSUS ZIP CODE
  2«.                          CLASS        44500912
            DATE      062476
  22.         CORRELATION COEFFICIENT = .1378
            95  PERCENT CONFIDENCE  INTERUAL = (-.1734,  .4240)
  20.
  18.
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                                                                                                   td
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X    -  ZIP  CODE (FIRST  DIGIT)

-------
 26.                          CM FUEL  ECONOMY STUDY
                             MPG UERSUS TERRAIN  INDEX
 24.                          CLASS        44500912
           DATE       062476
 22.        CORRELATION COEFFICIENT =-.0151
           95  PERCENT CONFIDENCE  INTERUAL = (-.3175,  .2902)
 20.
  18.
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  16.

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6.   j.     1.2    1.4    l.B    1.8   2.     2.2    2.4    2.6    2.8    3.
        TERRAIN  INDEX

-------
26.
24.
22.
  20.
                              GM FUEL ECONOMY  STUDY
                              MPG  UERSUS ELEUATION
                              CLASS        44500912
            DATE       062476
            CORRELATION COEFFICIENT =  .1525
            95 PERCENT CONFIDENCE I NTERUAL = (-.1588.  .4362)
  18.
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                                                   X
                                                                                                     td
          200.   400.   600.   800.    1000.
       ELEUATION C FT)
                                          1200.   1400.   1600.    1800.  2000.

-------
 26.                           CM FUEL  ECONOMY STUDY


                              flPG UERSUS  RELATIUE  HUM DI TY


 24.                           CLASS        44500912


            DATE       062476


 22.         CORRELATION  COEFF I C ENT  = .0684


            95 PERCENT CONFIDENCE  INTERUAL - (-.2406, . 3647)


 20.
  18.
  1G.



                        X

                    X         X

  14-                            X  X   x
                           X   X X  X
                                %     XX

                           x"  x   x   x

  12                        x    x   x           x




                        x   x   x


LjJ

Qi                                    X
a
u- 8.

0                          v
^                          x  X



      i      l      I      I      I      I      I      I      I      I      I
  6.   L0     ^5_    so.    65.    70.    75.    80.    85.    90.    95.    100.
                                                                                                    td
      »•  RELATIUE HUMIDITY  (PERCENT)

-------
?e.
24.
2?.
  20.
  18.
                              GM FUEL  ECONOMY  STUDY
                              MPG UERSUS PRECIPITATION
                              CLASS        44500912
            DATE       062476
            CORRELATION COEFF I C  ENT =-.1749
            95 PERCENT CONFIDENCE  I NTERUAL  =  < -. 4547.  .1363)
  16.
                                                                                                    N
  14.
  12.

-------
 26.                           GM  FUEL ECONOMY  STUDY
                              MPG UERSUS TEMPERATURE
 24.                           CLASS       44500912
            DATE      062476
 22.         CORRELATION  COEFFICIENT =  .2054
            95  PERCENT CONFIDENCE  INTERUAL = <-.1051.  .4794)
 20.
  18.
  16.
                 y-                       V"
  14-                     x                x   X     x
         V*   x x                           ••x
  12.
X     X
      X
      X
                  X
*                 X
S 10.
o             v

-------
  „..                           CM FUEL ECONOMY STUDY
                              MPG UERSUS  MILES PER DAY
  24.                           CLASS        44500912
            DATE       062476
  22.         CORRELATION  COEFFICIENT  =  .4031
            95 PERCENT CONFIDENCE  INTERUAL = (  .1130.  .6299)
  20.
  18.
  16.
  14.                  x
  1?.
° 10.
LU
K
O
"- 8.

            x     xx    x   x x    x
             X
XX     X
      X
"x     *
5             \    x
            I      I      I      I      I      I      I      1      I      I
            10.     20.     30.     40.     50.     60.     70.     80.     90.     100.
         MILES PER DAT
                                                                                                   tt
                                                                                                   i

-------
 28.                           GM FUEL ECONOMY STUDY
                              MPG UERSUS  POPULATION
 26.                           CLASS        45001413
           DATE       062476
 24.        CORRELATION COEFFICIENT  =  .3315
           95  PERCENT CONFIDENCE  I NTERUAL = (  =0307,  . 5773)
 22.
 20.
 18.
 16.
 1 4
                #       X                                         X
                                                                  X
                                   X
                 x
° 12.   xx         v    x        X
o              X
;?      vr   v         ^                         \/
   A y                                 A
u
K     v                             X
£ m           X                     V           X
"J- 10.           ^-                     X      _
                                                                                                  td
                                                                                                  (Jl
      I      I      I      I      I      I      I      I      I      -jf      I
 8.    ^      Jo.     20.     30.     40.     50.     60.     70.     80.     §0.    100.
x     -•   POPULATION  (THOUSANDS)

-------
  7f?.                          GM  FUEL ECONOMY STUDY
                             MPG UERSUS ZIP CODE
  26.                          CLASS        45001413
            DATE      062476
  24.         CORRELATION COEFFICIENT = .0324
            95  PERCENT CONFIDENCE INTERUAL =  (-.2742. .3331)
  22.
  20.
  IB.
  16.

O _        v-           X
  1 2.        X
5    v     v-     ^     X
*                            x
O    *                 y     *
^ to.  X     x           r;
      I     I      I      I      I      I      I      *     I      I      I
      0.     t.     2.     3.     -4.     5.     6.     7.     8.     9.     10.
      -  ZIP  CODE (FIRST  DIGIT)

-------
  28.                          CM  FUEL ECONOMY STUDY
                             MPG UERSUS TERRAIN  INDEX
  26.                          CLASS        45001413
            DATE      062476
  24.         CORRELATION COEFFICIENT =-.1868
            95  PERCENT CONFIDENCE INTERUAL =  (-.4644, .1242)
  22.
  20.
  18.
  16.
  14.     X
        X
O . _
  1 2.
                       X
                       X
CE        $              S
UJ        A              g
o        X              I
° 10.                    ^
£        x              x
T;
                       X
                                                                                                 td
x
  8-   .' 80 X   1 . 2    1.6    2.    2. 4    2. 8    3.2    3. 6    4.     4. 4    4. 8
      -   TERRAIN  INDEX

-------
2R.
24.
22.

                             GM  FUEL ECONOMY STUDY
                             MPG UERSUS  ELEUATION
                             CLASS        45001413
          DATE       062476
          CORRELATION COEFFICIENT  =-.1898
          95  PERCENT CONFIDENCE  I NTERUAL = (-.4668,  .1211)
18.
                                                                                                 co
16.
14.  X
    X
O
O
UJ
g
o
fc
12'
e.
       xx
         x
        x
        x
          1
                 X
                 x
                i
    0.     400.   800.   1200.
    -  ELEUATION (FT)
2000.   2400.
                                                2800.
                                                     3200.
                                                           3600.   4000.

-------
  28.                          GM  FUEL ECONOMY  STUDY
                             MPG UERSUS PELATIUE  HUMIDITY
  26.                          CLASS       45001413
            DATE      06247S
  24.         CORRELATION COEFFICIENT =  .1212
            95  PERCENT CONFIDENCE  INTERUAL  =  (-.1897=  ,4100)
  22.
  20.
  18.
  16.
  14-                            y  X
                               x  *XX
                               X

! l2'                              XXx   xX x
g                      •    x "  5  "X   x xxx
CK                               v         V
o                          X    x X ,,     $
u- 10.                             X   X   X
"X                         X
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X
^   I      I      I      1     v I      I      1      1      I     I      I
8.   5Q_    55.    60.    65.    70.    75.     80.     85.     90.    95.    100.
    -  RELATIUE HUMIDITY  (PERCENT)

-------
  28.                           GM  FUEL ECONOMY STUDY
                              MPG UERSUS  PRECIPITATION
  26.                           CLASS        45001413
            DATE       062476
  24.         CORRELATION COEFFICIENT  =  .0896
            95 PERCENT CONFIDENCE  INTERUAL = C-.2204, .3831)
  22.
  20.
  I 8.
  IS.
  14'              x                    X
                  *                       X     X *
                              X
ft-
5                          x                        x
  12.             x          XxX          X           X
5                          x                      x
LJ                          i^N ^      - W
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yj;                         /N  v*            S/
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^-10.                                ^   ^
fp                       ?S
£      X                                     x
                                           X
  pi      I  v   I      I      I      I      I      I      1      I      1
  °-   Q.     20. *   40.    60.    80.    100.    120.    140.    160.    180.   200.
X     «"  PRECIPITATION < MM)
                                                                                                   W

-------
  28.                           CM FUEL ECONOMY STUDY
                              MPG UERSUS  TEMPERATURE
  2B.                           CLASS        45001413
            DATE      062476
  24.         CORRELATION  COEFFICIENT  =  .4820
            95 PERCENT CONFIDENCE  INTERUAL = < .2087,  .6855)
  22.
  20.
  16.
  14.                            x
                     X<             X              X
                                            X
" ,,       X v>           X                  $
i           *              X                x
o           v    v  ^X v
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          X
8.  _Jj_     ^     4.   X ^_     ]2_    ]6_    ^Q_    24-    ^8_    ^2.     36.
       TEMPERATURE (DEC  C)

-------
28.
26.
24.
  22.
                              GM FUEL ECONOMY STUDY

                              MPG UERSUS  MILES PER DAY

                              CLASS        45001413

            DATE       062476

            CORRELATION  COEFFICIENT  -  .5273

            95 PERCENT CONFIDENCE  I NTERUAL = <  .2660,  .7164)
  20.
                                                                                                td
  18.
  IK.

ar

-------
44.
40.
36.
  32.
  28.
  24.
  20.
                              GM FUEL  ECONOMY STUDY
                              MPG UERSUS POPULATION
                              CLASS        45251014
            DATE       062476
            CORRELATION COEFFICIENT - .0725
            95 PERCENT CONFIDENCE  I NTERUAL =  (-.1653, .3023)
                                                                                                 w
                                                                                                 I
                                                                                                 h-fc-
                                                                                                 ^]
                                                                                                 OO
  16.

-------
  ,,,.                          GM FUEL  ECONOMY STUDY
                             MPG UERSUS ZIP CODE
  4n.                          CLASS        45251014
            DATE      062476
  3R.         CORRELATION COEFFICIENT = .0163
            95 PERCENT CONFIDENCE  INTERUAL = (-.2195.  .2503)
  32.
  24.


  70.


  ! G.

                 X
           X

I          x
cc
LJ
                             g£           Q
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  ^'0.     1.     2.     3.     4.     5.     6.     ?.     8.     9.      10.
X     -ZIP  CODE (FIRST  DIGIT)

-------
 44.                          GM  FUEL ECONOMY STUDY

                             MPG  UERSUS TERRAIN  INDEX

 40.                          CLASS        45251014

           DATE       062476

 3B.        CORRELATION COEFFICIENT =-.0253

           95  PERCENT CONFIDENCE INTERUAL  =  (-.2588, .2109)


 32.
  28.
 24.
  20.
                       X
  16.
  12.      i              5              *              X
§        1              *                             x


«        g              *
£8.      s              8
£                      x



  4-   .'80    1.2    1.6   2.     2.4    2.8    3.2    3.6    4.     4.4    4.8

x     -   TERRAIN  INDEX
                                                                                               w
                                                                                               I
                                                                                               l-k.
                                                                                               ^J
                                                                                               Ul

-------
  „«.                            GM FUEL ECONOMY STUDY
                               MPG  UERSUS ELEUATION
  40.                            CLASS         45251014
            DATE       062476
  36.         CORRELATION  COEFFICIENT --.0865
            95  PERCENT CONFIDENCE INTERUAL = (-.3150,  .1516)
  32.
  28.
  24.
  20.
  16.
iv     X X    ,^^
*          X X  X*,    *
O , -,        ^  .XXV5. -^ «f   X
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iiJ            X
         X  ^/ 5O
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S            xS
-------
  44.                          GM FUEL ECONOMY  STUDY
                             MPG UERSUS RELATIUE  HUNIDITY
  40.                          CLASS       45251014
           DATE       062476
  36.        CORRELATION COEFFICIENT  =-.0953
           95  PERCENT CONFIDENCE  INTERUAL =  (-.3231, =1429)
  32.
  28.
  24.
  20.

Q£                              X      X     X X
° 12.                              xx$xi^Xx
o        x           XX           X     8* g      X
w                                x          >
-------
  «4.                           Gh FUEL  ECONOMY STUDY


                              MPG UERSUS PRECIPITATION


  «n.                           CLASS        45251014


            DATE       062476


  36.         CORRELATION COEFFICIENT =-.0668


            95 PERCENT CONFIDENCE  INTERUAL =  (-.2971, .1708)


  32.
  28.
  24.
  20.
                    X
  16.

-------
  44.                           GM FUEL  ECONOMY STUDY
                              MPG UERSUS TEMPERATURE
  40.                           CLASS        45251014
            DATE       062476
  36.         CORRELATION COEFFICIENT = .0541
            95 PERCENT CONFIDENCE  INTERUAL  =  (-.1832.  .2854)
  32.
  28.
  24.
  20.
  16.
             xx. x^x                                 x  x
.-   ^ .,
o          X x  >TMx                                   X

uj                x                              X          ^
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  4-  -8.    -4.     0.     4.     8.     12.    16.    20.    24.    28.    32.
x     »  TEMPERATURE CDEC  C)

-------
 4«.                           CM FUEL ECONOMY STUDY
                              MPG UERSUS  MILES PER DAY
 40.                           CLASS        45251014
            DATE       062476
 36.         CORRELATION  COEFFICIENT  -  .5718
            95 PERCENT CONFIDENCE  INTERUAL = <  .3891.
 32.
  26.
  20.
  I K.
C3
            X*
               y
  8.         X
                      X      X X          x
                               XX,,       XX
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      I      I      I      I      1      I      I      I      I      I      I
      0.      10.     20.     30.     40.     50.     60.     70.     80.     90.     100.
      -   MILES PER DAY

-------
  26.                           GM FUEL  ECONOMY STUDY


                              MPG UERSUS POPULATION


  24.                           CLASS        45501412

            DATE       062476


  22.         CORRELATION  COEFFICIENT =-.3157

            95 PERCENT CONFIDENCE  INTERUAL =  <-.5076,-.0940)


  20.




  18.




  16.


        X

  14.


                                       XX

                                       X
                                    X
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S           x   x

5 10"   x           x  X      X      x                    x
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  6.   6.     10.    20.    30.    40.    50.    60.    70.    80.    90.    100.

x     -  POPULATION (THOUSANDS)
X
X
< X
x x
< V
\s <*f* >/
X
x x
X X
X
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x
X
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-------
2B.
24.
22.
  20.
  18.
                             GM  FUEL ECONOMY  STUDY

                             MPG UERSUS ZIP CODE

                             CLASS       45501412

            DATE      062476

            CORRELATION COEFFICIENT =  .1348

            95 PERCENT CONFIDENCE  I NTERUAL -  <-. 0967,  .3524)
  16.
                                                                                                 oo
                                                                                                 ts>
  12.
  10.

-------
 26.                          CM  FUEL ECONOMY  STUDY



                             hPG UERSUS TERRAIN INDEX



 24.                          CLASS       45501412



            DATE      062476



 22.         CORRELATION COEFFICIENT =  .0881



            95  PERCENT CONFIDENCE  INTERUAL - <-. 1433,  .3104)




 20.







 18.







 16.




        X

                       X

 14.     X
                       X



        *              |
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 S.   .'80    1.2    1.6   2.     2.4    2.8     3.2   3.6   4.      4.4     4.8


x     «'   TERRAIN  INDEX
td
oo

OJ

-------
  26.                           CM FUEL  ECONOMY STUDY
                              MPG UERSUS ELEUAT10N
  24.                           CLASS        45501412
            DATE       062476
  22.         CORRELATION COEFFICIENT = .1754
            95 PERCENT CONFIDENCE  INTERUAL = (-. 0554.  .3883)
  20.
  16.
                                                                                                   td
                                                                                                   I
                                                                                                   I—**
                                                                                                   CO
          x
            X
  14.              X
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               x
fc             x
  6-   0.     400.    800.    1200.   1600.   2000.   2400.   2800.   3200.   3600.   4000.
X     -  ELEUATION  (FT)

-------
26.
24.
22.
  20.
  18.
                             GM  FUEL ECONOMY  STUDY


                             MPG UERSUS RELATIUE  HUMIDITY


                             CLASS       45501412


            DATE      062476


            CORRELATION COEFFICIENT =-.4280


            95  PERCENT CONFIDENCE  I NTERUAL  = <-. 5980. -. 221 1>
                                                                                                   td
                                                                                                   I
  14.
                         X


                         X
  12.
a

-------
 26.                           CM FUEL  ECONOMY  STUDY
                              MPG UERSUS PRECIPITATION
 24.                           CLASS        45501412
            DATE       062476
 22.         CORRELATION COEFFICIENT =-.0210
            95 PERCENT CONFIDENCE  INTERUAL  = (-.2483,  .2085)
 20.
18.


16.

    X
             X
14.               X
                   X
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                                                                                                     w
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      0.     40.     80.     120.    160.    200.    240.   280.   320.    360.    400.
X     - PRECIPITATION 

-------
  2B.                           GM FUEL ECONOMY  STUDY
                              MPG UERSUS TEMPERATURE
  24.                           CLASS        45501412
            DATE       062476
  22.         CORRELATION COEFFICIENT = . 1746
            95 PERCENT CONFIDENCE  INTERUAL  = (-.0561,  =3876)
  20.
  18.
  16.

                                               X
                                                 X
  14.             X
                      X
                  x          *               x v   x     x
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  6.  -J0_   -5.     o.     5.     10.    15.     20.     25.     30.     35.     40.
      ~  TEMPERATURE ( DEC  C)

-------
  26.                            GM FUEL  ECONOMY  STUDY

                               MPG UERSUS fllLES PER DAY

  24.                            CLASS        45501412

            DATE       062476

  22.         CORRELATION  COEFFICIENT = .5232

            95  PERCENT CONFIDENCE  INTERUAL  = < .3347,  .6714)

  20.
  18.
  16.
  14.                                             X
                                                                    X

                                                   X                 X

                    xx        X     v           x                   x
  t2'               v   X  ,X  *XXXX    *                 X            *
                                v        X

-------
  26.
  24.
  22.
  20.
                   CM FUEL  ECONOMY STUDY


                   riPG UERSUS POPULATION


                   CLASS        65501512


 DATE       062476


 CORRELATION COEFFICIENT =-.1158


 95 PERCENT CONFIDENCE  INTERUAL  =  <-.3234,
                                                           1024)
  16.
                                                                                                   W
                                                                                                   i
                                                                                                   H-*.
                                                                                                   oo
  14.
       X
         x
X

X
                      X
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                                                   x
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o

-------
26.                         CM FUEL  ECONOMY STUDY
                           hPG UERSUS  ZIP CODE
24.                         CLASS        65501512
          DATE      062476
22.        CORRELATION COEFFICIENT = .0660
          95 PERCENT CONFIDENCE  INTERUAL = (-.1518.  .2777)
20.
1 fi.
16.
                                                                                              ttf
                                                                                              i
                                                                                              »-^
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1 1 1 1 1
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                                                              I
                                                              10.

-------
 26-                         GM  FUEL ECONOMY STUDY
                            MPG UERSUS TERRAIN  INDEX
 24_                         GLASS       65501512
           DATE      062476
 22.        CORRELATION  COEFFICIENT =-.0057
           95 PERCENT CONFIDENCE  INTERUAL =  (-.2211.  =2103)
 20.
 18.
 16.
 14.

a.
° 10.
I
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ai
K
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6-   .80    1.2    1.6    2.     2.4    2.8    3.2    3.6    4.      4.4    4.8
        TERRAIN  INDEX

-------
  2Fl.                           Gh  FUEL ECONOMY  STUDY
                              MPG UERSUS ELEUATION
  24.                           CLASS        65501512
            DATE       062476
  22.         CORRELATION COEFFICIENT =  .0543
            95 PERCENT CONFIDENCE  INTERUAL = (-.1633,  .2669)
  20.
  18.
  16.
M.


12.


ft
S 10.
5

-------
  26.                           GM  FUEL ECONOMY  STUDY
                              (1PG UERSUS RELATIUE HUMIDITY
  24.                           CLASS       65501512
            DATE      062476
  22.         CORRELATION COEFFICIENT =  .0083
            95  PERCENT CONFIDENCE  INTERUAL = (-.2078,  =2236)
  20.
  16.


  14.
     X                 X

  12.  X
iy
I 10.   X*                      x  ••    '•    H*x
O                             X   X   ^xx X
K                                           x
£ 8.               X    X         X        X
D-


X

1
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  6-   50.     55.    60.     65.     70.     75.     80.    85.    90.    95.    100.
 X     -  RELATIUE HUMIDITY (PERCENT)

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26.                         GM FUEL ECONOMY STUDY
                           f1PG UERSUS PRECIPITATION
24.                         CLASS       65501512
          DATE      062476
22.        CORRELATION COEFFICIENT =-.0477
          95 PERCENT CONFIDENCE  INTERUAL = (-.2607.  .1697)
20.
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  26.                           CM FUEL  ECONOMY STUDY
                              MPG UERSUS TEMPERATURE
  24.                           CLASS        65501512
            DATE       062476
  22.         CORRELATION COEFFICIENT =-.1175
            95 PERCENT CONFIDENCE  INTERUAL  =  (-,3250,  =1007)
  20.
  16.
  14.         X          X                x
            Ss?     X     X
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 X    -  TEMPERATURE (DEC  C)
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 26.                          GM  FUEL ECONOMY  STUDY
                             MPG UERSUS MILES PER DAY
 24.                          CLASS       65501512
            DATE      062476
 22.         CORRELATION COEFFICIENT =  .2648
            95 PERCENT CONFIDENCE  INTERUAL - < .0521.  .4545)
 20.
  18.
  14.                                        x      X
              x    *                                   xx
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1          x  xx    x xx
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£ 8.     X   X  X    x
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      0.     10.     20.     30.     40.    50.    60.    70.    80.    90.    100.
X     «  MILES PER DAT
                                                                                                  W
                                                                                                  I

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                         APPENDIX C

FORMULAS FOR COMPUTING FUEL ECONOMY AND TESTING FOR
        SIGNIFICANT DIFFERENCES IN FUEL ECONOMY
                              C-l

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                              APPENDIX C
    FORMULAS FOR COMPUTING FUEL ECONOMY AND TESTING FOR
            SIGNIFICANT DIFFERENCES IN FUEL ECONOMY*
Harmonic Mean Fuel Economy

                                         1
                              HMFE =
                                       mpg

where

                                      N
                            mpg =
                                   1
            N = number of cars per  class
         mpg. = miles/gallon for ith car in a class
Test Statistic
        It can be shown that the following quantity is distributed as a chi-
square with a level of confidence and one degree of freedom:
             r -/   1
             t-j - I =
                \mPgi
"Extracted from Environmental Protection Agency Report No.
 EPA-460/2-74-001, Appendix III.4
                                   C-3

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where
                        N
                         J
           NT = number of cars in Jth Subclass

         mpgT = mpg for Jth Subclass
             J
Sales Weighted Fuel Economy
                        SWMPG  =
                                       N.
where
           mPg-• = fuel economy for the jth car in carline Class i

              N. = number of cars in Class i
                i
              uj. = total sales of Class i cars  relative to either a division
                   or the entire fleet

              M = number of classes in a division or the entire fleet

        SWMPG = sales weighted harmonic mean fuel economy for a
                   division or the entire fleet
                                    C-4

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                                  NOTES
1.    1976 Commercial Atlas and Marketing Guide,  107th Edition, Rand
      McNally and Company, Chicago, Illinois (1976).

2.    The National Atlas of the United States of America,  U.S. Department
      of Interior Geological Survey,  Washington, B.C. (1970).

3.    Climatological Data, National Summary, Vol. 25 (1974) and Vol.  26
      (1975), National Oceanic and Atmospheric Administration,  U.S.
      Department of Commerce.

4.    M. E.  Williams, J. T. White,  L.  A. Platte, and C. J. Domke,
      Automobile Exhaust Emission Surveillance — Analysis of the FY 72
      Program,  Appendix III,  Environmental Protection Agency Report
      No. EPA-460/2-74-001 (February 1974).
                                    N-l

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                               GLOSSARY









AMPD     average miles per day




BBL       (number of carburetor barrels)




CID        (engine displacement)




EPA       Environmental Protection Agency




GM        General Motors (Corporation)




ID         identification




mpg       miles per  gallon
                                   G-l

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                                  TECHNICAL REPORT DATA
                           (Please read Initntctions on the reverse before completing)
 1. REPORT NO.
                             2.
                                                         3. RECIPIENT'S ACCESSION NO.
 4. TITLE AND SUBTITLE
  ANALYSIS OF GM FUEL ECONOMY SURVEYS
                                                         5.
                          1976
                                                         6. PERFORMING ORGANIZATION CODE
 7. AUTHOR(S)
  Ronald F. Janz
                                                         8. PERFORMING ORGANIZATION REPORT NO
               ATR-77(7358-02)-l
 9. PERFORMING ORGANIZATION NAME AND ADDRESS
  The Mobile Systems Group
  Environment and Energy Conservation Division
  The Aerospace Corporation
  El Segundo, California 90245
             10. PROGRAM ELEMENT NO.
             1 1. CONTRACT/GRANT NO.

                68-01-0417
 12. SPONSORING AGENCY NAME AND ADDRESS
  EPA Office of Air and Waste Management
  Office of Mobile Source Air Pollution Control
  Emission Control Technology Division
  Ann Arbor,  Michigan 48105
             13. TYPE OF REPORT AND PERIOD COVERED
                 Final
             14. SPONSORING AGENCY CODE
 15. SUPPLEMENTARY NOTES
 16. ABSTRACT
 Data obtained by General Motors Corporation in three fuel economy surveys of 1975
 GM private passenger car owners are analyzed to determine seasonal, bopographi-
 cal, and geographical effects on the fuel economy of in-use vehicles.  Data from the
 GM survey for  1532 cars formed the basis for this study.  Additional seasonal,
 topographical,  and geographical data associated with the locations of the owners
 were acquired from the  literature and added to the GM data  base.   Carline classes
 are defined that contain  cars with the following parameters in common:  GM Division
 Inertia Weight,  CID-BBL, Transmission Type, and Axle Ratio. Within each carline
 class, harmonic mean fuel economies are computed for groups of cars with
 extreme ranges in each  of eight seasonal, topographical,  and geographical param-
 eters.  The dependence  of fuel economy on these  parameters is determined by
 comparing fuel economies between groups.  Sales weighted harmonic mean fuel
 economies are  computed for analogous groups at  the division and fleet level.
                               KEY WORDS AND DOCUMENT ANALYSIS
                 DESCRIPTORS
 Automobile Fuel Economy
 Seasonal,  Topographical, and
  Geographical Effects on Fuel Economy
 GM Survey Data Correlations
                                            b.IDENTIFIERS/OPEN ENDED TERMS
In-Use Vehicle Fuel
 Economy
GM Car  Owner Data
Harmonic Mean Fuel
 Economy Calculations
                                                                        COSATI Held/Group
13F
21G
 8. DISTRIBUTION STATEMENT

  Unlimited
19. SECURITY CLASS (This Report/
  Unclassified
                                                                      21. NO. OF PAGES
20. SECURITY CLASS (This page)
  Unclassified
                          22. PRICE
EPA Form 2220-1 (9-73)

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