Since I'm in training for a 500 mile ride, I'm a bit of a fanatic about keeping track of my ave. speed. I always consider all the conditions when evaluating my performance and now I'm curious...What is the optimum for best ave speed? Flat road out and back with no wind? (I'd actually have not had the pleasure of no wind yet this spring) It would seem you'd gain going down hills what you lost going up but that hasn't really been my experience yet. I suppose that last 10 lbs I need to lose might remedy that? Also, it just doesn't seem I'm able to gain with the wind what I lost against it. Anyone have the facts on these issues?