There is no way Detroit can make even the smallest cars do 55 mpg. Heck, a 250 CC motorcycle won’t do 55 mpg. They will have to resort to cheating, like the flex fuel rule that lets automakers collect a serious CAFÉ credit for each flex fuel (runs on alcohol or gasoline) car they make. Or miss the 55 mpg target and pay Uncle some extra money to sell the non performing cars, (and raise their price).
This all comes from the greenies idea that they can prevent climate change (global warming we used to call it) by reducing the use of oil and gas. This is why Biden killed the Keystone XL pipeline on his first day in office. This is why Biden has canceled all oil and gas leases on federal land. Doing both of these things hiked the price of gasoline from $2.20 last year to $3.40 this year. The greenies believe that they can save the earth by killing off real cars and converting us all to battery cars.
Couples of things the greenies don’t know or ignore. Mining and refining the substantial amounts of lithium to make a battery car’s battery produces as much green house gas as a gasoline car will over its life time. The electricity to charge a battery car comes from power plants burning coal, natural gas, or oil. Thermodynamics says that only 30-40 % of the heat energy in the fuel comes out as electricity, the rest goes into the plant’s cooling system. The greenies are dead set against nuclear power and over the years have pushed thru safety regulations so bad as to make nuclear prohibitively expensive.