The US Department of Transportation has finalised revised Corporate Average Fuel Economy (CAFE) rules requiring automakers to hit a fleet-wide average of 34.9 miles per gallon by model year 2031, up from 30.1 mpg in MY2024. The standards apply to model years 2022 through 2031 and replace the framework introduced under the Biden administration.

USDOT framed the package as a reset aimed at cutting compliance costs and lowering new-vehicle prices. The department's regulatory analysis estimates the rules could reduce the average cost of a new vehicle by approximately $1,300.

Officials argued that the previous CAFE trajectory had pushed manufacturers toward heavier electric-vehicle investment than consumer demand supported, contributing to elevated transaction prices and reduced product-line flexibility. The revised trajectory, they said, gives OEMs more room to match output to retail demand.

Why is the fleet mix expected to flip?

The most operationally significant change is a vehicle classification overhaul effective MY2030. Small crossover models currently categorised as light trucks will be reassessed based on intended use rather than body structure.

NHTSA projects the reclassification will shift the national fleet mix from roughly 70% light trucks and 30% passenger cars to approximately 70% passenger cars and 30% light trucks. The agency says the change removes a structural incentive for manufacturers to engineer vehicles primarily to secure a light-truck designation rather than to meet consumer demand.

The department said smaller vehicles, including hatchbacks and estate cars, could see stronger production support as a result. Suppliers with passenger-car platform exposure should monitor the shift as product plans are revised for MY2030.

What happens to the CAFE credit market?

From MY2028, USDOT will terminate the CAFE credit-trading programme. Under the prior system, manufacturers could buy and sell credits to meet fuel-economy obligations across their product lines.

The department framed the termination as a way to force manufacturers to apply fuel-saving technologies across their own lineups. Tier-1 suppliers working on hybrid powertrains, engine downsizing, stop-start systems, and thermal management should expect OEMs to reallocate investment toward in-house efficiency programmes as the deadline approaches.

Who is supporting the rule?

NHTSA Administrator Jonathan Morrison said: "Newer cars are safer cars. By reducing vehicle prices, more American families will be able to afford newer vehicles, and sensible standards allow automakers more freedom to design and produce vehicles consumers actually want."

The Alliance for Automotive Innovation, the Washington-based trade group representing General Motors, Toyota, Volkswagen, Hyundai, Ford and other major automakers, welcomed the move. A spokesperson said: "We're still reviewing the final rule, but NHTSA made the right call to better align fuel economy standards with the law and current market conditions."

The group added: "The standards finalised under the previous administration effectively required a switchover to electric vehicles that was out of step with market realities and customer demand. Today's final rule is an appropriate course correction."

What to watch next

• Whether the Alliance for Automotive Innovation or individual OEMs request technical amendments or file legal challenges before the MY2022 compliance year takes effect.
• Supplier-level shifts in hybrid and thermal-management order books as the MY2028 credit-trading phase-out approaches.
• Product-planning announcements from Detroit and Asian-brand OEMs on small crossovers, hatchbacks, and estate cars ahead of the MY2030 reclassification.
• Congressional oversight hearings and any legislative effort to reopen the 34.9 mpg trajectory in the next review cycle.