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From: Currently somewhere in IL,IN,KY,TN,MO,AR,MS,AL, or FL
Z51 supercar tires. I'm a little over 19K and will need new tires soon so I'd say 20K is right. I drive very "spirited" and routinely carve turns over 0.8Gs. The secret is proper inflation and alignment.
I have an 08 Z51 with the Supercar tires and 12,000 miles. I anticipate buying new tires at 16,000 - 18,000 miles. It all depends how you drive. However, you will get more mileage out of the EMT (non Z51) tires. The Supercar tires are softer and will perform better than the EMT's. The downside is that the Supercars will wear faster. You play you pay!
I have 16k now and the rears need to be replaced this spring.