The U.S. Department of Transportation on Monday finalized a rule reversing Biden-era fuel-efficiency standards, reducing the 2031 corporate average fuel economy (CAFE) target for light-duty vehicles from 50.4 miles per gallon to 34.9 mpg.
The rule, announced by Transportation Secretary Sean P. Duffy, eliminates requirements for automakers to invest in electric vehicle production to meet emissions targets. The administration estimates the change will lower the average cost of new vehicles by $1,300 and save consumers $138 billion over five years.
Key changes under the new rule:
- Fleetwide average fuel economy target for 2031 reduced from 50.4 mpg to 34.9 mpg.
- No mandate for EV production to meet efficiency standards.
- Projected savings of $1,300 per vehicle and $138 billion in consumer costs over five years.
The National Highway Traffic Safety Administration (NHTSA) stated the rule aims to balance affordability, energy conservation, and safety, arguing that newer cars are safer and that reduced prices will make vehicles more accessible. NHTSA Administrator Jonathan Morrison said the standards restore "integrity" to the fuel economy program by allowing automakers "more freedom to design and produce vehicles consumers actually want."
The Department of Transportation framed the policy as a response to what it described as an "illegal mandate" forcing automakers to produce expensive EVs that families did not want. President Donald Trump echoed this sentiment on Truth Social, stating the rollback would "take the waste out of building cars in America" and save families "thousands on a new, beautiful and safe car."
Background and Context
The CAFE standards, established by Congress in 1975, set mandatory fuel efficiency benchmarks for automakers. The Biden administration’s 2024 rule had set a 50.4 mpg target by 2031, aiming to reduce emissions and accelerate the adoption of electric vehicles. The Trump administration’s new rule reverses this trajectory, reducing the target by 30% and removing EV production requirements.
The NHTSA projected the revised standards would result in a fleetwide average of 34.9 mpg by 2031, down from the 50.4 mpg target under Biden’s policy. The rule also eliminates provisions that tied fuel efficiency improvements to EV production quotas.
Economic and Environmental Implications
The Transportation Department claims the rule will lower upfront vehicle costs by an average of $1,300, making newer cars more affordable for American families. It also projects $138 billion in consumer savings over five years, though critics note that gasoline prices remain elevated due to geopolitical factors, including the war with Iran, which has disrupted global fuel supplies.
The administration argues that the policy will revive American automotive manufacturing by reducing regulatory burdens on automakers. Secretary Duffy stated the rule delivers "relief to families" and invests in the "beating heart of American manufacturing."
Opponents of the rollback, however, warn that weaker fuel-efficiency standards could increase long-term fuel costs and undermine climate goals. Environmental advocates argue the policy reverses progress in reducing greenhouse gas emissions from the transportation sector, which accounts for a significant portion of U.S. carbon output.
Industry and Political Reactions
The automotive industry has not issued a unified response, with some manufacturers expressing concerns over regulatory uncertainty while others welcome the flexibility to produce a broader range of vehicles. The rule’s elimination of EV mandates may ease compliance burdens for traditional automakers but could slow the transition to electric vehicles.
Political reactions have fallen along partisan lines. Republican lawmakers have largely praised the rule, framing it as a pro-consumer, pro-manufacturing policy that reduces government overreach. Democratic lawmakers and environmental groups have criticized the rollback, arguing it undermines climate progress and increases long-term costs for consumers through higher fuel consumption.
The rule takes effect immediately, with the NHTSA and Department of Transportation stating it will apply to vehicles manufactured in the 2027 model year and beyond. The policy marks a significant shift in U.S. fuel economy regulations, reversing a decades-long trend toward stricter efficiency standards.