Update----- Air density online says 3113 density altitude 91.22 air density at the time of the 8.854 run at 154.32 mph.. So, My Raceair Pro is reading 613 low at that point? If so that makes me feel better. With a speed of 154.32 and 3113 DA/91.22 AD It sounds like I will be running a fair amount better with some great air , tuning and chassis work! Now if I go on a diet,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,