Heavy Duty Trucking Logo
MenuMENU
SearchSEARCH

More Allegations Made in Repeal of Proposed Glider Kit Restrictions Under GHG Phase 2

Several members of Congress have asked the inspector general of the Environmental Protection Agency to look into allegations that there was improper contact between Volvo Group, the Truck & Engine Manufacturers Association, and the EPA regarding the agency’s regulation of glider kits under its Greenhouse Gas Phase 2 rules.

Deborah Lockridge
Deborah LockridgeEditor and Associate Publisher
Read Deborah's Posts
July 5, 2018
More Allegations Made in Repeal of Proposed Glider Kit Restrictions Under GHG Phase 2

Glider kits (this one from Freightliner) allow older powertrains to be used with new, aerodynamic cab bodies.

Photo by Deborah Lockridge

4 min to read


Several members of Congress have asked the inspector general of the Environmental Protection Agency to look into allegations that there was improper contact between Volvo Group, the Truck & Engine Manufacturers Association, and the EPA regarding the agency’s regulation of glider kits under its Greenhouse Gas Phase 2 rules.

In October 2016, EPA and the National Highway Traffic Safety Administration issued the final GHG/Fuel Efficiency Phase 2 rule. Among other things, this rule required engines in new “glider” vehicles to meet the emissions standards for the year the vehicle was assembled, rather than the year the engine was manufactured.

Ad Loading...

A glider vehicle is a truck that uses an older powertrain but has new body parts. The original intent of glider kits was to allow truck owners to repair vehicles that had been in a crash. But in recent years, owner-operators and fleets increasingly used them to avoid not only the higher cost of brand-new trucks, but also the maintenance headaches of engines required to use aftertreatment under newer emissions rules.

In July 2017, after Fitzgerald Glider Kits petitioned the agency to do so, EPA announced it intended to revisit those glider kit provisions. In November, it issued the official proposal.

This proposal to allow a glider kit loophole to the GHG/fuel economy regulations has drawn criticism from environmental groups, truck and engine makers, the American Trucking Associations, some large fleets such as FedEx and PepsiCo, two former EPA administrators, some state attorneys general, and some Democratic senators, among others.

Ad Loading...

The repeal proposal has yet to become a final rule. It's unclear at this point how the resignation of EPA Administrator Scott Pruitt may affect this process, although in general, changes in agency administrators often slow down rulemaking processes.

Just How Polluting Are Glider Kits, Anyway?

One of the key issues in this whole debate appears to be efforts to prove just how polluting (or not) glider kits are.

A Tennessee Technical University study that was funded by Fitzgerald Glider Kits apparently played a key role in the agency’s decision to revisit the rule. That study appeared to show that glider kits would not have as significant an environmental impact as previously argued by the EPA’s own study.

However, the universitylater disavowed the study pending a review of the validity of the research.

Now, two Congressional letters point to the agency’s own research into glider kits as suspect. They allege that Volvo Group had undue influence with some employees at the agency, provided glider kits for testing, and that the testing was done without the approval or knowledge of agency leadership. That testing found that glider vehicle NOx levels are four to 40 times higher than current powertrains and particulate matter levels are 50 to 450 times higher.

Ad Loading...

“The EPA would purportedly run the emissions testing according to specifications provided by [Volvo]…. At the very least, the EPA’s testing methods were highly questionable and should not be recognized,” said a letter from Brian Babin (R-TX), James Comer (R-KY), Steve King (R-IA), and Bill Posey (R-FL).

Another letter to the IG came from Greg Gianforte (R-MT), chairman of the House Subcommittee on the Interior, Energy, and Environment. It raised similar concerns, saying, “collaboration between agency employees and a regulated entity to potentially sway the outcome of NVFEL tests in order to disadvantage a competitor compromises the EPA’s integrity and allows a handful of agency staff and one company the opportunity to manipulate the regulatory process.”

Volvo denies any wrongdoing in the matter.

"Like most of the trucking industry, the Volvo Group for several years now has argued that the improper use of glider kits is bad for the environment and unfair to manufacturers who have invested in the latest environmental controls,” said a Volvo Group spokesman in response to HDT’s request for comment. “All our communication and cooperation with the EPA on this issue has been an entirely appropriate part of a broad trucking industry advocacy effort – we did nothing improper."  

The letters also asked the IG to look into the Truck and Engine Manufacturers Association for a potential lobbying violation, because the lobbyist was once a senior employee of the EPA and was instrumental in the drafting of the Phase 2 rule, yet “communicated and influenced the EPA less than 10 months from his departure.”


Related: Senators, Former EPA Chiefs Urge Agency to Drop Glider Reg Repeal

More Fuel Smarts

Crowd at Volvo booth at ACT Expo
Equipmentby Deborah LockridgeMay 8, 2026

How Volvo’s New D13 Engine Meets EPA 2027 Emissions Without Sacrificing Power or Fuel Efficiency

Volvo says advances in combustion and aftertreatment helped its new EPA 2027 D13 engine avoid the fuel-economy penalties many once expected from tighter NOx emissions limits.

Read More →
Two men in chairs on stage with big video screen behind them showing Tesla Semi
Fuel Smartsby Deborah LockridgeMay 7, 2026

'TCO’s Here.' Tesla Says Electric Semi Economics Are Ready for the Mainstream

Tesla’s Semi chief at ACT Expo outlined production growth, lower-cost models, charging expansion, and why the company believes fleets are leaving money on the table by waiting on electric trucks.

Read More →
Electric semi trucks parked at a charging station with overhead charging equipment, representing challenges in heavy-duty EV infrastructure deployment.
Fuel Smartsby News/Media ReleaseMay 5, 2026

What Will It Take to Scale Electric Truck Charging? New Electrification Coalition Report Identifies 11 Solutions

A new report from the Electrification Coalition outlines key barriers slowing electric truck charging deployment and offers policy solutions to accelerate infrastructure growth.

Read More →
Ad Loading...
NACFE Run on Less 2026 findings.
Fuel Smartsby Jack RobertsMay 1, 2026

NACFE: Fleets Need to Recalibrate TCO Strategies as Electric Trucks Gain a Long-Term Edge

NACFE’s Run on Less data has found that recent setbacks aside, electric truck powertrains are trending toward market leadership by 2025.

Read More →
Gray Volvo tractor pulling trailer on open highway
Fuel Smartsby Deborah LockridgeMay 1, 2026

New High-Horsepower Natural Gas Engine Could Expand Fleet Options

Westport and Volvo are demonstrating a 500-hp truck with diesel-like efficiency — one that also offers what Westport says is a better pathway to using hydrogen fuel in trucks.

Read More →
Illustration with oil wells silhouetted against red and gold sky
Fuel Smartsby Deborah LockridgeMay 1, 2026

Why Fuel Diversification Matters for Trucking Fleets

Relying on diesel alone exposes fleets to fuel price volatility. Here’s why diversification with electric, natural gas, and renewable fuels can reduce risk.

Read More →
Ad Loading...
Range Energy eTrailer.
Fuel Smartsby News/Media ReleaseApril 17, 2026

Range Energy Confirms eTrailer Performance in Winter Testing as Commercial Rollout Nears

Range Energy said its production-ready eTrailer system proved it can boost stability, safety, and efficiency in sub-zero winter conditions as the company moves toward scaled deployment.

Read More →
Circles with trucks demonstrating sustainable features and Top Green Fleets logo
Fuel Smartsby Deborah LockridgeApril 16, 2026

Top Green Fleets of 2026: Nomination Deadline Extended

Is your company a leader in sustainability efforts among trucking fleets? If so, Heavy Duty Trucking's editors want to hear from you.

Read More →
Youtube thumbnail featuring man in Big-Lebowski-inspired sweater
Fuel Smartsby Deborah LockridgeApril 13, 2026

New Lightweight Wheel Cover Targets Simpler Aero Gains [Watch]

Watch to learn how Deflecktor's new wheel cover design is taking a simpler approach to aerodynamics, with an eye toward making it more practical for both trucks and trailers.

Read More →
Ad Loading...
Dual truck tires with black aerodynamic wheel cover and a man bending down getting ready to take one off
Fuel Smartsby Deborah LockridgeApril 10, 2026

Deflecktor: Hubbub Aerodynamic Wheel Cover Cost-Effective Even for Trailers

Aerodynamic wheel covers can deliver small but meaningful fuel-economy gains for fleets, and Deflecktor says its latest design aims to make the technology easier and more affordable to deploy.

Read More →