What the proposed fuel-economy rollback could mean for drivers and automakers

The Trump administration’s proposal would reduce the 2031 fuel-economy target for new cars and light trucks from 50.4 miles per gallon under the Biden-era rule to 34.5 mpg. That is a decrease of 15.9 mpg, or about 32%. The figure comes from the administration’s proposal; reports ahead of the planned September 28 release said the final rule was still forthcoming, so the published text is needed to confirm its exact terms. 358

What the lower target changes

Corporate Average Fuel Economy (CAFE) standards apply to automakers’ vehicle fleets, rather than requiring individual drivers to choose a particular kind of car. Under the proposal, the fleet would face a less demanding efficiency target, and electric vehicles would not be counted in setting that target. 23

That distinction matters when officials describe the Biden-era policy as an “EV mandate.” The standard encouraged manufacturers to improve fleet efficiency; it did not require every driver to buy an EV. Electric models could help automakers meet efficiency requirements, but they were not the only possible response. 23

The trade-off: purchase price versus fuel use

The administration says easing the standards would make new vehicles less expensive. Its proposal projected savings of $1,000 on the average new vehicle, while Reuters reported that the Transportation Department’s estimates also showed higher fuel consumption and carbon-dioxide emissions under the weaker standards. These are projections, not guaranteed results for every buyer or vehicle. 15

For drivers, the practical trade-off is between a possible lower upfront price and the fuel costs of driving a less-efficient vehicle. Drivers who use more gasoline would be more exposed to higher fuel spending, particularly when gas prices are high. The available estimates do not establish whether a particular buyer would come out ahead over the vehicle’s lifetime. 5

Implications for EVs and automakers

A weaker efficiency target reduces the regulatory pressure to improve vehicle efficiency, while excluding EVs from the target calculation removes one way those vehicles could contribute to meeting it. The administration has also moved to rescind a separate fuel-economy accounting provision that had incentivized EV production. Together, these changes reduce policy support for using EVs to meet federal fuel-economy requirements. 318

The revised target gives automakers more room to meet the standard without the same level of efficiency improvement. But the policy change alone cannot establish how companies will alter their product plans or what the effect will be on their long-term competitiveness. Those outcomes will depend on decisions and conditions beyond the target itself.

What remains uncertain

The 34.5-mpg figure is the proposal’s projected 2031 fleetwide average, not a confirmed final figure in the source reports available ahead of the planned release. A legal challenge to the rollback is also expected, so the rule’s lasting effect may depend on the final text and subsequent court proceedings. 3510