That's a separate regulation:

Under the proposal, automakers would be required to improve the average mileage of all the passenger vehicles they sell by 2 percent a year for passenger cars, and 4 percent a year for light trucks, between 2027 and 2032.

If implemented, the plan means new autos sold in the United States would achieve an average fuel economy of 58 miles per gallon by 2032. Analysts project that in order for automakers to achieve that average, roughly two-thirds of the new cars they sell by that year would have to be all-electric.