I like that this is the direction we are headed; gov't telling private companies how it's done......
However, I would like to point out a glaring omission. These new 'rules' reports tend to forget that these numbers are for NEW vehicles. Not necessarily including vehicles already manufactured, selling, and being used day-to-day by people.
So that means the 'average' of 54.5MPG will not be reached by including the vehicles already on the road, even in 2025, most likely. They will only count the ones that are made from a certain arbitrary date, and average out certain classes of vehicle, etc, etc.
Just like now, the current 28.3MPG is only for new vehicles, though I do not know the details of that set of standards; whether they apply only to new cars, or to the whole 'fleet' of cars by auto maker x......