Hi , got my car new 1 yr ago. Have just done 12000 kilometers. This equals 7460 miles. I seldom drive it very hard hard certainly not race style. I notice now the rear two would be easily 2/3rd worn. It has Bridgestone 275 - 35 x 21" Runflats on it since new. At this rate I doubt if I will get 12000 miles. Has anyone had a similar experience of mileage on a same car I wonder ? And I wonder if there is a better replacement for when the time comes ?