White House moves to roll back vehicle fuel economy rules, with new standards due Monday

President Donald Trump has said the United States will adopt new fuel economy standards for cars and light trucks that reverse the requirements put in place by his predecessor, promising lower vehicle prices and a rebound in domestic production. The announcement, made in a social media post on Saturday, sets the stage for the most significant US retreat yet from policies designed to accelerate the transition to electric vehicles.

In the post, Trump said the new standards would "TERMINATE" what he called the Biden administration's "EV (electric vehicle) mandate," accusing the previous administration of burdening automakers with costly rules and pushing consumers toward electric cars. He wrote that the changes would "take the waste out of building cars in America," adding that this would mean "LOWER PRICES, saving families thousands on a new, beautiful, and safe car."

The claim that a federal EV mandate exists has drawn pushback from experts and industry analysts. While Trump and his fellow Republicans have frequently used the term "EV mandate" to describe the higher fuel-efficiency requirements adopted under Joe Biden, there is no federal law or guideline requiring Americans to buy electric cars, nor any rule prohibiting the sale of petrol-powered vehicles. Efficiency rules govern what manufacturers build, not what drivers choose to buy.

At the heart of the policy is the Corporate Average Fuel Economy, or CAFE, system, established by the US Congress in 1975. Under CAFE, automakers must meet average fuel economy targets across all the cars and light trucks they sell each model year. Because the standard is a fleetwide average rather than a requirement applied to each individual vehicle, a brand that sells a gas-guzzling model must offset it by selling more efficient vehicles to stay in compliance with government rules.

The rules now being rolled back were finalised by the Biden administration in 2024. They required the average fuel economy of the US vehicle fleet to rise from 39.1 miles per gallon (mpg) to roughly 50.4mpg by 2031. At the time, the administration argued that the tighter standards would cut fuel consumption and greenhouse gas emissions while also reducing what motorists pay at the pump.

Those standards also had an indirect effect on the composition of the market. Facing a rising average economy requirement, manufacturers accelerated the growth of their electric vehicle line-ups, retooling factories and committing billions of dollars to battery production in order to meet the targets. That industrial shift made the sector particularly exposed to any change in federal policy, and made the rollback financially significant for automakers that had bet heavily on electrification.

The change comes after Congress had already moved to weaken the other pillar of the previous administration's electric vehicle strategy. The Republican-controlled legislature gutted consumer tax incentives for electric vehicles last year as part of Trump's One Big Beautiful Bill Act. Taken together, the repeal of purchase subsidies and the loosening of emissions-efficiency rules signal a broad, coordinated reversal of Biden-era transport and climate policy, and a widening gap between US policy and global trends that continue to favour electric vehicles.

Trump's announcement did not include the technical details of the new standards, leaving significant questions unresolved about how quickly the requirements would phase in and how they would be enforced. However, he had previewed the direction of the policy in December 2025, when he announced a proposal that would set the industry-wide fleet average for light-duty vehicles at roughly 34.5mpg by 2031. That figure would be more than 30 percent lower than the target established during the Biden years.

US Transportation Secretary Sean Duffy reposted Trump's announcement, saying a formal announcement would be "COMING MONDAY." Al Jazeera has reached out to the White House for comment.

Industry observers caution that a lower fuel economy standard delivers mixed results. Automakers that have invested heavily in electric drivetrains and battery supply chains stand to gain flexibility, since they will no longer be required to offset the emissions of larger, less efficient vehicles with electric models. Consumers, however, face a trade-off: the rollback removes a regulatory driver of efficiency, and because the cost of producing a battery-electric vehicle remains higher than that of a conventional petrol vehicle, the long-term savings at the pump that the Biden rules were designed to deliver will be correspondingly reduced.

There is also a question about how the standards will interact with state-level rules. Several states have adopted their own emissions and sales targets that remain in force independently of federal policy, meaning that manufacturers operating in those markets will still need to build a supply of compliant, increasingly electrified vehicles even as national requirements are relaxed.

The coming announcement will therefore be closely watched by automakers, suppliers and environmental groups alike. What remains unclear is whether the rollback will be a simple adjustment to the CAFE targets, or a broader rewrite of how vehicles are regulated. For now, the direction of travel is clear enough: Washington is preparing to prioritise affordability and production volumes over fuel efficiency and emissions reduction, and to end a regulatory regime that the industry had spent two years building around.