http://itrca.com/forums/viewtopic.php?f=14&t=12631
A common item that is often discussed with performance tires is tread wear or tread life. In the post below I point out two key factors to pay attention to. The first is tread depth, which is the physical amount of tread the tire comes with new.
Tread Depth
Bridgestone Potenza RE-11 - 9/32" (All sizes)
Dunlop Direzza Sport Z1 Star Spec 10/32" (Most sizes), 9/32" (14'' and 195/50-15 sizes)
Falken Azenis 615K 8/32'' (All sizes)
Kumho Ecsta XS - 9/32" (205/50-15), 8/32" (215/45-16), Other sizes vary from 8/32" to 11/32"
Toyo Proxes R1R - 8/32" (195/55-15, 205/50-15, 205/45-16), Other sizes are either 8/32" or 9/32"
Yokohama Advan Neova AD08 - 9/32" (205/50-15), Other sizes are either 9/32" or 10/32"
The second is treadwear. These numbers must be taken with a grain of salt since each manufacturer uses their own test to assign this rating. That means it is likely that some use these ratings to help market their tires. I use this rating as a reference only when comparing tires. I would not base my decision to purchase a tire solely off this rating.
Treadwear Ratings
Bridgestone Potenza RE-11 - 180 A A
Dunlop Direzza Sport Z1 Star Spec - 200 A A
Falken Azenis 615K - 200 A A
Kumho Ecsta XS - 180 AA A
Toyo Proxes R1R - 140 AA A
Yokohama Advan Neova AD08 - 180 AA A
Current Pricing:
Bridgestone Potenza RE-11 - $119, 205/50/15 - $162, 205/45/16
Dunlop Direzza Sport Z1 Star Spec - $89 195/55/15 - $107, 205/50/15
Falken Azenis 615K - $104, 205/50/15 - $126, 215/45/16
Kumho Ecsta XS - $94, 205/50/15 - $100, 215/45/16
Toyo Proxes R1R - $99, 195/50/15
Yokohama Advan Neova AD08 - $113, 205/50/15
Venders
Discount Tire
Phil's Tire Service
Tire Rack
Vulcan Tire
References
Current Deals on Falken 615 Azenis *Old 615 Model
Current Deals on Dunlop Direzza Sport Z1 Star Specs
Tire Rack Extreme Performance Tire test:
Tire Test Video



*These tests pre-date tires like the new Falken Azenis 615K's
Reference