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Airline Economax: Like, 6'4" and above. Too little legroom, too broad shoulders. I already struggle and I'm only 5'11"
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Carmax: 7ish feet? you're probably reaching the point before it becomes uncomfortable before then, though, given ceiling heights and seats only sliding back so far
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Busmax: Most city busses have a maximum floor-to roof height of 8ish (or a little more) feet, if you're lucky. You could probably sit if you were a bit taller up to 10 feet, but taking up multiple seats and squeezing through the door.
and so on and so forth for increasingly ridiculous sizes
