This helps me figure how good the track is prepped if I can cut a decent 60' at 18psi. They also change when heated, so I dial them down a bit after a few passes and go down to 15-13psi also depending on the track and how wobblier it feels at the top end.
This is on M/T ET streets, Not street radials.
"Speed costs money. How fast can you afford to go". -DarkZide