I am 6' 8", and I put about 3500 miles a month on my Challenger driving back and forth to work each day (using combination of various DFW interstates, freeways, & surface roads between here and there), so I feel like I've got a good handle on staying comfortable in the Challenger driver's seat for extended driving. And I gotta say, the way I've found that best suits me is to move the seat all the way back and down as far as it will go. Then I bump it forward just a couple clicks, and then I lay the back of the seat down toward the back seat until it is almost touching the back seat's lower seat cushion.
That is as as comfortable for me while driving that car as any position I've tried in the previous 4 years of driving a Challenger. What is really good about that position for me when on long road trips is that I can put the cruise on and then fold my legs back Indian-style to give them a little stretch and change of scenery, but still be able to quickly hit the brake should something arise that requires my manual input.
Other than that I can't think of any seat position that would provide extreme comfort on long trips while maintaining your ability to re-engage the steering controls and brake/gas at a moments notice. I mean, you could probably get more comfortable than what I described, but I don't think it would leave you in a safe position should a deer run out in the road or someone come into your lane suddenly.
That's all I got, I hope something was of help...be sure to update this thread with any breakthroughs you might happen to discover on your own though. I'm always game to try a different way to relax while I'm spending my 2nd or 3rd hour of the day stuck in stop-and-go traffic
