Goodyear just had to give a buddy a new set of tires for his camaro because they have a ton of run out on them, like 1 1/2" out of round, they had 25 pases on them and vibrated all the time.
Another buddy needs tires on his 9.50 chevelle he calls them and goodyear tells them to replace tires every 30-45 passes because the tires will be junk.
I noticed a lot of guys with door cars trying to stretch the use of tires out and then they become inconsistent or sidewalls go away fast. Seems rule of thumb on a fast door car is 50 passes, a slow one 100 passes.