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https://www.epa.gov/automotive-trends/highlights-automotive-trends-report
" . . . because cars and trucks are subject to different GHG and fuel economy standards. . . "
GHG = Greenhouse Gas
Notice that there are a lot more "truck SUVs" than "car SUVs." Yes, regulation makes a difference.
Plus, a lot of people just plain like SUVs. I fully embrace the fact that we have a multiplicity of factors!
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Please paint me a timeline or two in which these vehicles have a much lower trajectory.