I've noticed definite uncomfortableness while driving too, though a lot of that is just noticing how poorly fit my car's driver seat is to my body size. I've spent a good deal of time tweaking my bike's fit, but there's just not a lot of adjustments in my car... and i don't feel as comfortable emptying all of my pockets into a little bag on the steering wheel so I'm also getting poked more in the car. stupid car...