GMC Sierra 2014 Automatic Gasoline mileage: 300 KM or more 4WD GMC Sierra Z71 2014 Automatic transmission Gasoline Mileage: 300,000 km or more 4WD For sale GMC Sierra 2014. Engine and transmission are guaranteed. Inspection available. New registration. The car's interior has been completely redone. New tires. Mileage 350,000 (can increase). 4WD. Original body except for one piece, no putty. Contact the number. I am just an advertiser. 0540523944