GMC Sierra 2013 Automatic Gasoline mileage: 300 KM or more For sale, the Sierra has driven 490. Body, chassis, airbags, transmission are guaranteed. It has a 6-liter engine, steel cam, Z/28 cam, full intake, KN filter, headers, and custom exhaust. Bullet cat-back exhaust, and it has spacers. Interior is clean and free of defects. The car is solid, no noises or rattles. It comes with a distinctive license plate.