CAFE has to be the winner, or a strong candidate, for the worst, stupidest, and most destructive federal economic policy ever devised, just in terms of scale and stupidity.
Why don't they get rid of it? Not even the MAGA coalition, which are either neutral or actively antagonistic to environmental goals, plus pay lip service to inefficient government and over-stepping bureaucracy and red tape?
Because for arcane reasons, the big incumbent automakers actually benefit from CAFE, that's why. MAGA only seems to recognize policies as "waste, fraud and abuse" if said policies benefit regular Americans. Policies that benefit their industry masters at the EXPENSE of regular Americans, like CAFE, all seem to get passed over and left in place. And when American cars get too expensive to be competitive, they just pass tariffs to eliminate the competition. It's a big club, and you aren't in it.