18,000 miles on my RE-92's, but mine did end up being almost completly bald and one even pop'd on me. So 18k is a lot of miles on those crappy tires.
The Mile street tire guy is in my networking group. He was telling me that nowadays, most new cars have tires that last fron 5-10k and thats it. Unlike when you could buy a old buick and and run it for 40k without worring about the tires.