I read an interesting article about seating position and the short version is that many people who find the seating position in their cars uncomfortable are guilty of trying to tilt the seat-back back and the seat cushion up at the front. While it would seem that the lying back position would give support to your back the opposite has been found to be true. The recommendation was to level the lower seat cushion and then raise the back of the cushion slightly to give a slight slope forward to the seat bottom. The theory is that the higher you raise the front of the seat, the more your spine is forced into a straight (un-natural) position. As you drop the front of the seat, it allows your pelvis to tilt forward and your lower spine to curve into a more natural position. It sounded crazy, but since I was experiencing serious back pain after driving my C6, I thought I would give it a try.
It feels weird at first and you feel like you would slide off the seat. However after driving for a whole day, I was convinced. Before, a 20 minute drive to work would leave my back in spasm. After 6+ hours with the seat in the new position, I had no pain. I adjust every seat I encounter in this manner and find it continues to work. Works well in my GS460 which is my new DD. I notice when I get stuck with a cheap rental car with no ability to adjust the seat cushion angle that the pain quickly returns. I got the wife to try this because her 3 hour daily commute was causing her back pain. She tried it and she does not complain about having pain in her back anymore. YMMV
