I got 23k miles out of the rear OEM 17" Goodyear NCT5s which were standard on the sport package. As they cost $700 for just the 2 rear tires, I opted to replace all four with non-RFT Conti DWS for about $600 which will probably give about 45k on the rear and 70k on the front.
I would NOT recommend the NCT5s as they are summer touring (not performance) tires with only adequate performance at an exorbitant price.
Tom
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