I just got back from an evening 30 mile ride, the temp was 65F and it was the best ride I've had since I began riding at the start of summer. For the past 3 months I've been riding 3 or 4 times a week, the temp has usually been in the 80s or higher and my average speed for my 30 mile route stayed stubbornly at 15 mph. Tonight it was 17.4 mph and I finished feeling as if I could do it all over again. Its amazing how much effect temperature has on performance, does anyone have information about temperature/performance issues.