CAFE regulations for 2027-2031 will require a 2% annual improvement in the fuel efficiency of passenger cars and 2% in light trucks.

Compared to the 4% annual increase proposed previously, smaller improvements would be required for trucks and SUVs, which are currently held to lower standards and emit more CO2.

The EPA calls for 56% electric vehicles and 13% plug-in hybrids by 2032, but companies like GM could slow the EV rollout.

By 2032, the average fleet efficiency will be around 38 mpg, well below the originally proposed 43.5 mpg.

By 2027, EVs will be rated as if they were getting 300 miles per gallon, allowing automakers to produce more gasoline vehicles.