Trump administration rolls back vehicle fuel economy rules, lowering 2031 target to 34.9 mpg

The Trump administration's Department of Transportation has finalized new fuel efficiency regulations that substantially reduce the emissions and economy standards required for U.S. passenger vehicles. Transportation officials characterized the measure as a major deregulatory action.

What changed#

The new rules represent a sharp departure from the Biden-era standards that had set an ambitious target of 50.4 miles per gallon for fleet-wide average fuel economy by model year 2031. Under Trump's framework, that target falls to 34.9 mpg—barely above the 30.1 mpg benchmark that had been established for 2024. The shift effectively abandons the fuel-efficiency improvements that the auto industry had been working toward over the past several years.

The cost debate#

The Trump administration asserts that its regulatory approach will reduce new vehicle prices by approximately $1,300 per unit on average, totaling $138 billion in savings over five years. However, these projections have drawn scrutiny from independent analysts.

Critics counter that drivers will face steeper operating costs. According to the Biden administration's analysis, its original standards were projected to save consumers $23 billion collectively in fuel expenses and more than $600 per vehicle owner over a car's lifetime.

Industry and public response#

Automakers have largely embraced the relaxed requirements. By contrast, public health and environmental advocates have mounted sharp opposition. According to the American Lung Association's leadership, "There is no reason to weaken standards that are technologically feasible and have a direct benefit for the quality of the air people breathe."

Consumer advocacy and environmental groups argue that weaker efficiency benchmarks will ultimately prove costly for households through higher fuel bills, increased air quality-related health expenses, and climate-related damages tied to elevated emissions.