Trump moves to roll back U.S. fuel rules

On Sept. 26, 2026, President Donald Trump announced on his social media platform that he had approved new U.S. fuel economy standards. He said the policy would terminate what he described as the Biden administration’s electric-vehicle mandate and would lower prices for new cars. Trump characterized the changes as a benefit for both automakers and consumers, asserting that manufacturers were eager to build vehicles under the revised rules.

In his post, Trump linked the new standards to reduced production “waste” and to savings for families on what he described as “beautiful, and safe” cars. He also claimed that a range of automakers were interested in expanding production in the United States under the new regime. These statements framed the standards as a competitiveness and affordability measure for the domestic auto industry.

Following Trump’s announcement, the White House had not yet released the final rule text for the fuel economy standards. This left the precise regulatory requirements and timelines undisclosed at that moment. Nonetheless, administration officials indicated that further policy action closely tied to the announcement was imminent.

Transportation Secretary Sean Duffy said that a “major victory for America’s auto workers is COMING MONDAY,” signaling that additional details or related measures were expected shortly after the Sept. 26 statement. This suggested that the announcement marked the beginning of a broader shift in transportation and auto policy rather than a completed process.

The policy shift is grounded in a Transportation Department and National Highway Traffic Safety Administration proposal to revise Corporate Average Fuel Economy standards. Under this proposal, the required fuel economy for the new-vehicle fleet would be about 34.5 miles per gallon through model year 2031. This would replace a Biden-era fleetwide target of about 50.4 miles per gallon over the same period.

Regulatory analysis for the proposal projects that easing the standards would reduce the average upfront cost of a new vehicle by about $930. At the same time, NHTSA estimated that the weaker efficiency targets would increase fuel consumption by roughly 100 billion gallons through 2050. The analysis also anticipates that fuel spending would rise by about $185 billion and that carbon dioxide emissions would increase by about 5% compared with the prior standards.

Policy analysts cited in coverage of the proposal say the rollback, combined with earlier congressional action removing penalties for noncompliance with CAFE rules, has significantly weakened the standards’ enforceability. One assessment described the rules as having become more of a “suggestion,” reflecting reduced legal and financial pressure on automakers. This change in incentives is expected to affect manufacturers’ long-term product planning.

Observers and experts expect that the lower fuel economy requirements will reduce regulatory pressure on automakers to prioritize rapid electrification of their fleets. They also anticipate that the revised standards are likely to face legal challenges once finalized, creating uncertainty around the durability of the new regime. For now, the proposal signals a clear policy turn toward looser fuel efficiency requirements and a different balance between vehicle costs, fuel use, and emissions.