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Because the CAFE standards are a US thing

During diesel gate I did a lot of research, none of which I still have sadly. Diesel emissions regulations were generally slightly stricter in the U.S. I found that pretty surprising at the time.

That may explain why diesel is so rare for consumer cars and SUVs in the US compared to Europe.

The cars are smaller than in the US but they are getting bigger. For example, the VW Golf is 0.6m longer between the first model and the last one.