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Poster #2 seems to know their stuff BUT- I have an old L4-L5 injury and my back pain is controlled by doing exactly the oposite- I'm only pain free if I tilt the seat bottom all the way up in the front and down in the back- I think his analysis is good for avoiding stressing the nerve in it's course thru the muscles but may pinch the same nerves on their way out of the spine in some people- point is (to paraphrase a certain Russian author) EVERY BAD BACK IS DIFFERENT! Fiddle around and do what works for you and change position during long drives to pass off work to different muscle groups.
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