You have to look at my HP props .... I set my weight at 3200 lbs when in reality my car weighs 3330 with me in it. I have always set it there so for comparison reasons I leave it there.
It's just an estimate anyway, there is another Talon here that has lower 60-90 and 70-90 times but puts up 30-40 more wheel hp than me.
Ps: we do our dyno pulls on a Mustang AWD dyno, so numbers are always a little lower than more favourable dynos (Dynojet, Dynopack)