My wife gets mad but I do little burnouts in my shop(facing out the door just in case) but it lets me see my contact patch on the cement. If its real dark on the edges of the black marks I know I don't have enough air and so on. It just helps me get close before I go to the track. When we go to Ennis we usually have to ad 1/2 to 1 psi to eliminate the tire squaring up. Each track may take a little different psi also.