GMC Sierra Z71 2018 Automatic Gasoline mileage: 176 KM 4WD 2018 Sierra, full option, original body, praise be to God. Engine, gearbox, chassis, airbags are sound and guaranteed. Mileage is 176 and subject to slight increase. The car has not been modified, praise be to God. It only has a 40,000 BTU transmission cooler. The car is for sale to the highest bidder. Any offer below 100, I apologize.