Those calculations are not all that corrected, because MPH isn't taken into account. I cannot find the old calculator that had the MPH in the equasion. Those equasions are based upon an average. Lets say your run a 9.2, but at near 90mph, you will probally break into the 12's, but if you ran 8.2 but at 80mph, you'll be somewhere in the 13's.