To contribute to the thread, I may not be the biggest but maybe the heaviest. 6'0" 284lbs, 44 in waist, 54 in chest, and have never turned down a meal in my life. The seats are very comfortable for me. I have the steering wheel tilted up slightly. My seat is moved just about all the way back with a slight recline. It took me a very long time to find the perfect spot but I have taken an 8 hour drive one way with no pain in my legs or back and I'm on the other side of 40.
I was told by the dealer that this is a small mans car before my test drive but after owning a 240z and seeing how much room that small car has, I was determined to make it work, glad I did!