We're on our second Prius.....'05, and '10. The Integrity tire yielded about 35000 for the '05....second set still good when we traded up to the '10...which has yokohamas. At 23k, we need to replace the tires with winter coming on. It sounds like the Bridgestone Ecopia has rendered the best performance. By the way, don't ever treat the computer mpg as gospel. First, the odometer reads about 5% error..typically a short mile! This has been true for both of our cars. But...we're still averaging 50+ for trips, and with the '10, about 46 around town, other than winter.