I just replaced my OEM Toyo's at a whopping 28,650 miles having maintained air pressure and rotations at 5k intervals. 3 tires were down to 2/32 whereas one was at 3/32. The Toyo rep told me that this is typical of OEM spec'd tires as auto manufacturers will request that the tires for a given car are soft for a cushy test drive. Sounded like a load of BS to me but I also read similar explanations on-line. BTW, Toyo was willing to kick in a 30% credit for a replacement set of tires by an authorized dealer but the cost of the replacement tires exceeded the Pirellis, even w/the discount. I told the rep that they need to re-think their strategy of putting the soft, lesser quality tires on as I'd never consider a Toyo branded tire again! I ended up getting the best price at Walmart.com and then had America's Tire do a price match.