Ya there is alot of difference racing at sea level, we have to change the complete nitrous tune up, and sometimes even take some first gear away, and then that changes the clutch set up, but you are right many do run their best. Have you ever been down by pensacola, a few years ago we raced there and the corrected altitude was 485 feet below sea level. everyone was burning their shit up. We had to replace a few pistons between rounds.