GMC Sierra 2016 Used Automatic Gasoline mileage: 422 KM or more First owner GMC Sierra, just completed full maintenance: spark plugs, tune-up, and programming to the car's original factory settings since purchase. No modifications or alterations. Mileage: 422,000 km. There is paint on the edge of the front right fender, and the steering wheel airbag deployed and has been replaced.