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a loophole in the cafe standards says the longer the wheelbase the less the fuel economy has to be and the manufacturers find it more cost effective to make bigger vehicles rather than develop efficient engines.
https://www.wired.com/story/the-us-wants-to-close-the-suv-loophole-that-supersized-cars/
This is 100% correct, and now they have put most people in an arms race as who buys the biggest one to feel “safer”