No, this isn't about global climate change. Last Saturday night at Atlanta Dragway, my competitor and I both broke out, him by about 3 hundredths and me, by about 5 hundredths. The air had not changed by any big amount, about 200 DA change down and temperature maybe 2 degrees from the previous run. My short time was identical, only 1 thousandth separated the two. The bike picked up not quite1 hundredth to the eighth and mph was virtually identical. By the stripe, it had picked up 4 hundredths and 2 mph. Now, my bike never picks up this much in the second half, and the other guy did too and he didn't expect it either. So, the question is: can there be that large of a weather change during a run to affect the performance that much? I know it sounds weird and I may just be grasping at straws, but I have seen it rain at the big end and be dry at the starting line. Maybe someone else has experienced this and can enlighten me.