That is the most idiotic, assumption-based article I've ever read (except every article about Toyota).
There's no reason for that to happen. IF...a huge "IF"...the gov't wanted to dictate specific vehicles, they'd have to have a personal vendetta against cars like the Camaro SS and the Corvette, because they get similar mileage as most large sedans and small SUVs, as well as the fact that they make up a minute percentage of all vehicles sold in the US.