Automakers have spent years engineering vehicles around increasingly demanding fuel-economy requirements, adding electrification, downsized engines, complex transmissions, and other technologies to squeeze out additional efficiency. The Trump administration now wants to ease that pressure substantially.
Washington argues that if manufacturers don’t have to spend as much money meeting aggressive efficiency targets, vehicles should become cheaper to produce. Whether that ultimately makes the number on the window sticker any lower is another question.
According to Reuters, the Trump administration is preparing to announce sharply reduced federal fuel-economy requirements. Transportation Secretary Sean Duffy says the goal is to give Detroit greater freedom to build the vehicles consumers actually want rather than forcing manufacturers toward increasingly efficient fleets.
The final rule hasn’t yet been published, although automakers reportedly expect something close to an earlier National Highway Traffic Safety Administration proposal. That plan would target a fleetwide average of roughly 34.5 mpg by 2031, compared with approximately 50.4 mpg under the previous Biden-era requirements.
NHTSA Says Cars Could Cost $930 Less
NHTSA estimated that its proposed changes could reduce the cost of a new vehicle by roughly $930. For an industry struggling with affordability, that’s a decent chunk of change.
There is no requirement, however, that automakers pass the full savings directly to customers. Manufacturers could lower prices, preserve existing prices and improve margins, increase incentives, or redirect the savings toward other areas of vehicle development.
Corporate Average Fuel Economy standards regulate manufacturers’ fleets rather than retail prices, so a car becoming $930 cheaper to engineer or manufacture doesn’t automatically mean its MSRP falls by the same amount.
The New Target Would Be Much Lower
The end of the EV madness is here!
Thanks to @POTUS, we are resetting fuel economy standards and putting the American people back in the driver’s seat because… Freedom Means Affordable Cars! 🚘https://t.co/blLPOnF6mF
— Secretary Sean Duffy (@SecDuffy) December 8, 2025
The expected 34.5-mpg target would represent a substantial retreat from the roughly 50.4-mpg fleetwide figure established under the Biden administration. The earlier rules called for relatively aggressive annual efficiency increases and were designed in part to encourage manufacturers to sell greater numbers of electric vehicles.
The Trump administration is also expected to make compliance easier by revising requirements retroactively back to the 2022 model year. Because automakers can earn credits for exceeding standards and use them toward future compliance, changing those earlier requirements could provide manufacturers with additional breathing room.
Congress has already eliminated financial penalties for automakers that fail to meet fuel-economy standards. Combined with the proposed rollback, that significantly reduces the regulatory pressure previously pushing manufacturers toward higher-efficiency vehicles.
Lower Costs Come With Higher Fuel Consumption
The savings estimated by NHTSA don’t come without tradeoffs. The agency projected that its proposal would increase U.S. fuel consumption by roughly 100 billion gallons through 2050.
NHTSA also estimated an additional $185 billion in fuel spending over that period and approximately a 5% increase in carbon dioxide emissions. Drivers could therefore potentially save money when buying a vehicle while spending more to fuel it over its lifetime.
The balance between purchase price and operating cost will depend heavily on the individual vehicle. Larger trucks and SUVs could particularly benefit from looser fleetwide standards, while their owners would remain more exposed to fuel-price fluctuations.
Automakers May Not Change Cars Overnight
Even if the new requirements are finalized soon, showroom products won’t transform immediately. Vehicle development programs typically stretch across several years, meaning many cars and trucks arriving in the near future were engineered around regulations that existed before the latest policy change.
Political uncertainty creates another complication. Fuel-economy requirements have now swung repeatedly between administrations, while automakers must make product and investment decisions years before vehicles reach customers.
Softer MPG requirements could certainly reduce compliance and engineering costs for manufacturers. Whether shoppers eventually see cheaper cars, larger profit margins for automakers, or some combination of both will take considerably longer to determine.
The underlying proposal and NHTSA estimates are confirmed by Reuters; the final standard had not yet been announced as of the report, so the 34.5-mpg figure remains the expected target rather than a finalized rule.