XL 2018 Automatic Gasoline mileage: 173 KM Yukon 2018 black XL long SLE Body, engine, gearbox, differential are original (agency spec). Only pads, belt, and spark plugs have been changed. Full hood protection as well as full front fenders PPF. Added an oil cooler for the gearbox to preserve its lifespan And changing the gearbox oil every 70,000 km.