Fuel Savings


Without a way to close the tractor-trailer gap, high-speed air rushes into the void, causing a low-pressure area that drags on the tractor hurting fuel economy.


With TruckWings, the gap is closed causing air speed to drop and reduce downstream turbulence. An increase in back-of-cab pressure reduces overall drag on the tractor-trailer – especially in high crosswind environments.

Don’t just take it from us, hear from the experts
TotalSIM US, an independent leader in assessing aerodynamic devices, verified the savings claims of TruckWings using Computational Fluid Dynamics (CFD) complying with the SAE J2966 standard practice on modelling heavy truck aerodynamics.

What’s included in this 22-page report

  • Breakdown of all sources of drag on a tractor-trailer 
  • In-depth analysis on how TruckWings reduces drag
  • How TruckWings improve resilience to crosswinds 
  • How TruckWings improve overall vehicle stability

About TotalSIM US
TotalSIM US is a trusted partner for aerodynamics in the trucking industry, with a co-founder serving on the Society of Automotive Engineers (SAE) Committee that helps shape industry-standard CFD testing procedures used towards approving EPA SmartWay devices. 



This compilation of TruckWings fuel test results and aerodynamics research conducted with independent third parties is designed to demonstrate TruckWings savings potential across a variety of equipment and locations. Scroll down to learn more about the different types of fuel tests used. 

Equipment Type Test Type Report Date Independent Group Fuel Savings
Day Cab CFD Simulation November 2020 TotalSIM US 4.1%
Day Cab In-Service Pilot Test November 2020 National fleet 4.1%
Day Cab In-Service Pilot Test October 2020 Oklahoma based fleet 3.7%
Day Cab Modified TMC Type II February 2020 Utah based fleet 3.2%
Day Cab In-Service Pilot Test June 2019 National fleet 4.0%
Day Cab CNG CFD Simulation January 2021 TotalSIM US 4.3%
Day Cab CNG In-Service Pilot Test November 2018 National fleet 5.5%
Sleeper In-Service Pilot Test November 2020 Utah based fleet 3.6%
Sleeper In-Service Pilot Test August 2020 Canadian fleet 3.9%
Sleeper Track Test April 2018 MVTS 3.7%

Decoding the different types of fuel tests

Computational Fluid Dynamics

Simulates on-road conditions to generate drag forces and animated visuals of air flow around a truck.

  • Excellent repeatability following
    SAE standard procedures
  • Can iterate quickly making it ideal for testing different designs. 
  • Accepted method of proof for EPA SmartWay and CARB programs.
Controlled Road & Track Tests

These standardized tests follow rigorous procedures to eliminate any variables that may impact results.

  • Standardized results following TMC and SAE test protocols.
  • Cost intensive and removes trucks from operation during the test.
  • Limited representation of real-world operating conditions a truck would experience on the open road. 
In-Service Pilot Tests

Structured in-service tests produce the most meaningful results for TruckWings’ impact to a fleet’s bottom line.

  • No impact to operations beyond a one-time install.
  • A single test can collect 3 million miles of data in as little as 2 months.
  • Proves savings on fleet’s routes, drivers, and equipment against a monitored control group.

66 fuel tanks weighed in controlled tests

242 yarn tufts applied for flow visualization

85,000 CPU hours of computational fluid dynamics

3,813,640 miles tracked on in-service fuel tests