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MENTAL PROTECTION AGENCY »
U.S. ENVIRONMENTAL PROTECTION AGENCY
SmartWay-verif led Aerodynamic Technologies
EPA's SmartWay Transport
Program is a market-driven
partnership to help busi-
nesses move goods in the
cleanest, most efficient
way possible. By providing a
consistent set of tools and
information needed to make
informed transportation
choices, SmartWay enables
companies across the country
to benchmark performance
data in ways that protect our
environment,encourage eco-
nomic vitality, and enhance
our nation's energy security.
EPA's SmartWay Technology
program helps carrier fleets
make informed business
decisions to save fuel and
improve their supply chain
efficiency.
This new program element
is part of the 2OI5 SmartWay
trailer program updates that
include adding large refrig-
eration trailers and incorpo-
rating multiple aerodynamic
performance evaluation tools.
EPA's SmartWay Technology Program has expanded to allow trailer aerodynamic
verification through multiple testing pathu/ays.
EPA's SmartWay Technology Program verifies fuel savings from aerodynamic devices and low-
rolling resistance tires that can be used on 53-foot box dry van and refrigerated in long-haul
operations.
EPA verifies individual devices or combinations of devices tested using SmartWay's robust
protocols; these devices are known as "SmartWay-verified" devices. SmartWay aerodynamics-
test protocols create consistent, comparable fuel-savings estimates under high-speed cruise
conditions for long-haul tractor-trailers.
In 2015, EPA finalized the use of expanded testing-verification pathways to include an enhanced
track test, wind tunnel testing, coastdown testing, and computational fluid dynamics (CFD). If
trailer aerodynamic devices demonstrate fuel savings in SmartWay testing, they are identified as
SmartWay-verified and are listed, along with SmartWay-verified low-rolling resistance tires, on the
SmartWay website's technology verification page (www.epa.gov/smartway/forpartners/technology.htm).
Trailer aerodynamic devices can be verified with any of these methods. Previously, SmartWay -
verified devices were tested using one method. Manufacturers may now choose from three (3)
SmartWay protocols to determine fuel savings for verification. Manufacturers have the option of
testing their device using additional SmartWay protocols to receive additional recognition within
the online verified device table. For example, a manufacturer could initially test and verify a
device using a wind tunnel test. If the manufacturer also conducts coastdown testing on the same
device, the SmartWay technology webpage will indicate that the device has demonstrated fuel
savings with both wind tunnel and coastdown testing. This provides fleet managers with added
confidence that the device has demonstrated fuel savings.
EPA also replaced device-based verification categories with performance-based categories for all
aerodynamic device testing. Aerodynamic devices that fall into these new performance thresholds
are demonstrated to achieve fuel savings of 1%, 4%, 5% and 9% or more.
Fleet managers can select individually-verified aerodynamic devices from any of the performance
thresholds and combine them to meet to the total fuel savings threshold required to qualify as
EPA—designated SmartWay or SmartWay Elite trailer. For example, the SmartWay trailer threshold
of at least 5% fuel savings could be achieved by using a 5% device or combining a 1% and a
4% device. A SmartWay Elite trailer designation could be earned using a 9% package or pairing
individual 4% and 5% components.
A listing of SmartWay-verified devices can be found on www.epa.gov/smartway/forpartners/
technology.htm
The table on the following page shows the difference between SmartWay-verified
technologies, combinations of these technologies, and EPA-designated SmartWay
and SmartWay Elite trailers.
Continued
U.S. EPA SmartWay | EPA-420-F-I5-006 | www.epa.gov/smartway
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U.S. ENVIRONMENTAL PROTECTION AGENCY"
SmartWay
MENTAL PROTECTION AGENCY »
SmartWay-verified Aerodynamic Technologies
Continued
Terminology
SmartWay-verified low-rolling
resistance tires
SmartWay-verified aerodynamic
device
SmartWay-verified Elite aerody-
namic technology combinations
SmartWay Trailer
SmartWay Elite Trailer
Definition
Low-rolling resistance tires that
have been verified to achieve 1%
fuel savings for trailers
A trailer fairing (front, side, rear,
or under-trailer) that have been
SmartWay-verified to produce
1 %, 4%, or 5% fuel savings
for trailers
A combination of multiple trailer
fairings (front, side, rear, and/
or under-trailer) that have been
SmartWay-verified to produce 9%
fuel savings for trailers
A 53-foot box dry van or refriger-
ated trailer that uses SmartWay-
verified low-rolling resistance tires
and aerodynamic technology(s) to
achieve a total of 6% fuel savings
(1% from trailer tires; 5%
from aerodynamic
technologies)
A 53-foot box dry van or refriger-
ated trailer that uses SmartWay-
verified low-rolling resistance
tires and SmartWay-verified Elite
Aerodynamic Technology Combi-
nations to achieve a total of 1 0%
fuel savings (1% from trailer
tires; 9% from aerodynamic
technologies)
Fuel Savings At a Glance
1% or greater
1 %, 4% or 5% or greater
9% or greater
6% or greater
10% or greater
Aerodynamics on trucks will perform differently depending upon driving speeds, tractor and trailer set-up,
and the weather. The SmartWay verification program guides fleets to devices with demonstrated performance
using controlled verification testing at high-speed cruise conditions (for consistent comparison). Even though
some fleets may see fuel savings higher than the EPA verified levels, many fleets may operate at lower speeds.
While SmartWay test methods establish uniform measurement
conditions, EPA is also conducting research to provide fleets with
information on how they might adjust fuel savings estimates based
on their unique operating conditions. These fuel savings are still
significant and smart business.
For more information: www.epa.gov/smartway/forpartners/
technology.htm or Tech_Center@epa.gov
U.S. EPA SmartWay | EPA-420-F-15-006 | www.epa.gov/smartway
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