I'm 6'4" and 250 lbs and I drive either a small Volvo station wagon or a VW GTI. I fit in them just fine and my knees aren't a problem. Hell, the seats in my Volvo are so good I sit in them when my back hurts.
I want to climb into my vehicle and not damn near tear my knee
More evidence for my theory that the prevalence of SUVs and trucks is because old people can't handle low cars, and old people are the only ones buying new cars at the moment.