Clearly these are pulls through 50mph, starting for the most part in 2nd gear at about 40mph. I think this is the best way, as it is difficult to obtain accuracy from a "standing" speed.
For instance, I have timed 60-90 on my wrx several times, starting at 60mph, and have obtained times from 3.4 sec to 3.9 seconds in consecutive sets of pulls. Who knows if I was starting right at 60 each time, or if my stopwatch was used accurately?
Pulling through 60 is noticeably faster, although with still inconsistent times due to using a stopwatch. Just wanted to clarify the rules here before I add my data.