same problemo here. Im six foot, got long legs and I get very uncomfortable on long runs in the car. Problem is the seat base doesnt go back far enough, so my legs are kinda splayed and forced upwards, which puts pressure in my lower back. Then, to compound the problem, the seat back wont tilt forward far enough to support my back, so I tend to hunch forward. The seat itself is actually very comfortable, but if it had a fraction more adjustment, it would be fine for me. I had the same problem in the Golf - 34" legs are great for cycling, not for driving...
g