No, I used to be thinner, now I am chunkier. Like the peanut butter.
Not sure what you meant by thinner and uncomfortable. Can't see how weight would impact, unless one was so large as to be uncomfortable just fitting in the seat??
I just meant for someone of my height, I have shorter legs, thus a longer torso. Not circus freak dramatic, but noticable to me. I have no problems with leg room in the back, although my wife is pretty short. I just hit my head on the downward lip.
My brother is about the same height as I, and does not hit his head. But he is more evenly proportioned than I.
I gotta think someone who is 6' 5" and didn't hit was either slouching; or is short of torso and long of leg.
Spike