I don't fit in compact cars, and it has NOTHING to do with weight. Fact is, those of us who are 6'4"+ just do not fit in compact cars comfortably. This is especially true for me, since my legs are slightly longer than average for my height. I have real trouble driving even my wife's Ford Edge (compact SUV) and long drives in my Ford Fusion with someone behind me (making me move my seat up even a little) kill me. You can talk how great your little cars are on gas mileage, but it's useless to me unless I go all Ed "Too Tall" Jones in Police Academy and rip out the front seat and drive from the back seat. How is it safe for me to be wedged 1/2 sideways in the front seat with my head rubbing the roof liner? Why should I, through no fault of my own and due solely to my genetic background, be forced to pay radically more for a car or fuel because all those people who aren't even average height can fit in a little rice-burning Civic or Elantra? I am almost 6 inches taller than the average American male (which is 5'10 1/2" -->
http://en.wikipedia.org/wiki/Human_height#Average_height_around_the_world), and much of this difference in is my legs. Don't be an ass and assume that everyone that NEEDS a larger car does so because of weight. Width-wise, I can drive anything...assuming it has at least the REAL leg room (not some made up number that is obviously BS like most car companies do..trust me, there are very few cars whose 39" of leg room are real #'s rather than an effective 35-36". In fact, I am pretty positive the 42.3" number for my Fusion is BS, unless you count all that space under the pedals that is useless when one drives wearing shoes.
Add in the fact that everyone (yes even my wife) in my family plays ice hockey, and even the relatively massive trunk on my Fusion is not big enough when I take my 11 year old, 6 year old, and myself to hockey practice (both are back to back on Tuesday nights, and I coach both). 3 hockey bags and 6 sticks take up the whole trunk a good chunk of the interior space. Even though I use a shorter than average stick for someone my size, the one time I had to use a rental Corolla when my car was rear-ended made getting to the rink a miserable experience. My bag (even though I don't wear shoulder pads when I play so my bag's not that full) would NOT fit in the trunk (2007 model), and my sticks could not fit across the back seat from right rear floorboard up to the back left of the rear window so I had to lay them in the space between the front seats. Needless to say, that is not really safe or comfortable.
Frankly, I'd love to spend less on my cars and for gas, but until the car makers find a way to get me some more leg room, that's not going to happen.