As I have always said the track is the best way to humble those big HP numbers. Like pointed out mph and weight, after that it is simple math.

The ONLY exception to an that is for throttle stop cars. Yep everyones favorite subject. Anyway the farther a car is capable of running under it's index the more MPH they tend to loose. For instance my car will loose 6-8MPH running S/ST vs all out MPH. But MPH is still the best judge of HP.