GMC Sierra Z71 2012 Used Automatic Gasoline mileage: 503 KM or more 4WD GMC Sierra 2012. The car I know has 3 pieces of paint. Its engine, differentials, and chassis are guaranteed. It has a Corsa muffler, Y-pipe, and King springs. Mileage is 503,000. The car has been redone from bumper to bumper. It runs great, ماشاء الله (masha'Allah). The price is 43,000.