Got them on a new 2011 Cadillac CTS4 V6 and now have to change them at 48,000km's(back at 3.2mm/front at 4.5mm wear). Different size on the front from the back, so they can't be rotated. The only reason I'm changing them now is because of an upcoming trip through the Rockies. Otherwise they would easily last another 20,000km's. Great tires which are being replaced with the same size and brand. Good job on these Michelin.