I don't know how many miles I've gotten out of them as I always wear the fronts out before the rears. (No, I didn't get 50,000 miles.) I could do some calculations and include the extra pair, but in general, the fronts will wear out around 8 to 9000 miles. But then my convertible Mini is a full JCW car with 220 hp and I drive it hard so I really don't care about tire mileage.
They are fantastic tires, though, and perform remarkably in dry and wet. Car and Driver did a tire summer high performance tire test a while back and these Hankooks took 2nd place to the Dunlop Direzzo's (not available in my size). These Hankooks actually bettered/equaled the popular Michelin PS2's. Read what Car and Driver had to say here: http://www.caranddriver.com/comparisons/hankook-ventus-v12-evo-page-10
They're really great tires and for the price, they're awesome!