I drive an older "full size" SUV ('04 Ford Expedition), mainly because my parents' gave the thing to me when I graduated college. It's fairly easy to work on, so I kind of just keep the thing running. The fuel economy is very bad (like 17 mph highway, 11 in the city), but it's one of those situations where even if I bought a new car with double the fuel economy, it'd take me over a hundred thousand miles of driving to make up the cost difference in fuel savings alone.

It's also really nice to be in a situation where literally everything I own can be moved with it. Strapped my box spring / bed frame to the top of it once.