Trump administration eases fuel‑economy rules

The Trump administration on Sept. 28, 2026 finalized a rule that relaxes federal fuel‑efficiency standards for new cars and light trucks. The measure reshapes the trajectory of U.S. vehicle mileage requirements by setting new targets for automakers over the coming years. The Department of Transportation and the National Highway Traffic Safety Administration released the final rule on Monday and submitted it for publication in the Federal Register.

Under the regulation, automakers are required to reach an industrywide combined fleet average fuel efficiency of about 34.9 miles per gallon for model‑year 2031 vehicles. The rule alters earlier expectations for how quickly fleet fuel economy would increase, replacing previously tougher standards. Agency analyses published with the rule included modeled fleet projections and regulatory impact estimates to describe its long‑term effects.

Administration officials framed the new standards as a response to concerns about vehicle affordability and regulatory costs. They argued that easing fuel‑economy requirements would lower upfront prices for new vehicles and reduce compliance burdens on automakers. This framing positioned the rule as a support measure for both the auto industry and consumers in the new‑vehicle market.

President Donald Trump publicly celebrated the decision, using social media to call the change a “BIG DAY FOR AMERICAN AUTO WORKERS AND CAR BUYERS.” The message underscored the administration’s emphasis on jobs in the auto sector and on near‑term purchase prices for consumers. Officials highlighted these themes as they promoted the rule as a signature shift in national vehicle policy.

Environmental and public‑health groups sharply criticized the rollback of tougher fuel‑economy rules. They warned that weakening mileage requirements would lead to higher pollution over time, as vehicles consume more fuel than they would under stricter standards. These organizations argued that the rule would undermine efforts to limit emissions from transportation, a major source of greenhouse gases and air pollutants.

Advocacy groups also raised concerns about the impact on household budgets, saying that lower fuel efficiency would increase fuel costs for drivers at the pump. They contended that any savings from reduced vehicle purchase prices could be offset by higher gasoline expenses over the life of a vehicle. These warnings set up a clear debate over whether the rule ultimately benefits or harms consumers.

Trade groups representing automakers reacted positively to the final rule and said they were reviewing its details. Industry groups have long sought regulatory certainty and have raised concerns about the cost and pace of meeting more stringent fuel‑economy targets. The more gradual efficiency trajectory in the new rule aligns more closely with those concerns.

With the rule now finalized and headed into the Federal Register, automakers will begin planning their product strategies around the 34.9‑mile‑per‑gallon target for model‑year 2031. The release of modeled fleet projections and regulatory impact estimates provides a framework for assessing how the rule may affect vehicle design, sales mix and operating costs in the years ahead. Public debate over the environmental and consumer implications is likely to continue as the new standards take effect.