US Fuel Economy Rules Finalized, Setting Up Higher Pump Prices

The US Department of Transportation has locked in a new set of fuel economy standards that will loosen the efficiency targets automakers must hit, a move that is expected to push fuel costs upward rather than down. Under the finalized rule, the 2031 fleet-average target drops from 50.4 mpg to 34.9 mpg, a change the National Highway Traffic Safety Administration says would add $185 billion in fuel costs for drivers and lift carbon emissions by roughly 5%.

The math behind the shift is stark. Because a lower mpg figure means more gasoline is burned to cover the same distance, the average fuel required for a given trip climbs by about 44%. On top of that, higher overall demand for gasoline tends to nudge pump prices up further. A Department of Energy analysis cited in the debate estimated that the policy direction could raise gas prices by around 76 cents per gallon — a finding that reportedly carried the sign-off of an Energy Department official with ties to the oil sector.

Public response during the comment period was overwhelmingly negative, with most of the 68,294 submissions objecting to the plan. The change also follows earlier congressional maneuvering that effectively set CAFE fines to zero, meaning enforcement of the old standards had already been weakened before this week’s finalization. Supporters of the rollback have framed it as relief for consumers, but the government’s own projections suggest the opposite: more gallons bought and a higher price per gallon.

The broader context is a global energy market already under strain, with oil prices at elevated levels. By stepping back from efficiency mandates, the US risks falling further behind automakers in China and elsewhere who are pouring resources into electrified and low-consumption vehicles. Analysts expect legal challenges to follow, since courts have previously struck down similar regulatory reversals.