GMC Sierra Z71 2012 Automatic Gasoline mileage: 300 KM or more 4WD Peace be upon you. Sierra for sale, 2012 model, mileage 375,000. The vehicle's condition is as shown in the inspection report. There is a knock in the gear that comes and goes, it's not constant. Interior: The seats are good, but the ceiling on the passenger side is torn. Inspection and registration are expired. The price is 17,000, slightly negotiable.