There are some things you are not understanding about driving.
I was referring more to the missshifting into 5th than the tapping the rev limiter...
In my cougar when I ran it at the track in the 1/4mi i would hit the rev limited about 1/4 second before hitting the trap at the end of the strip and I would lose time and trap speed by shifting into 4th rather than just sticking it out in 3rd, so I know why you would do that.