SLE 2015 Used Automatic Gasoline mileage: 120 KM GMC Yukon XL. The car has 120,000 km on it and is considered like new. Clean and guaranteed. Transmission, engine, chassis, airbags, body are all guaranteed. The car is guaranteed from bumper to bumper. In short, the car is new. It has had protection applied since it left the dealership and interior covers since it left the dealership. First owner. Without 4WD.