Trump plans to weaken fuel efficiency rules for cars and trucks

[haele]

4. Fuel efficiency standards cover a lot of standards...

Not just environmental.
I remember "beginner cars" back in the 1980's - a Pinto Hatchback generally got 25/28, just a bit better than a basic 4 banger Ford Ranger with 4 on the floor (kids, ask your parents what that means).
While my dad's old 1960 2 door Valiant, considered one of the first compact cars, got around 12/15 mpg. When gas was 25/30¢ a gallon, it wasn't so painful to fill up, that was still a lot of money; I remember him complaining in the early 1970's when it finally cost him $10 to fill up after a longish trip and he decided he needed to get one of those newer, cheaper made cars that could get up to 18 to 20 mpg on the highway.
Fuel efficiency lead to better engineering when it came to the engine performance as well as environment. It ended up saving people money, as they used less fuel and still got the same amount of vroom.
Removing standards so manufacturers don't need to build better cars is not a matter of "facing the reality of the auto business", it's just the continuation of the enshittification of US business to quickly and easily make money off consumers, not to bring an actual product with value to market..