GMC 2018 GMC Yukon XL SLT 2018 GMC Yukon XL SLT SPECIFICATIONS, PRICE & IMAGES Fuel Type: Gasoline Exterior Color: Onyx Black City MPG: 16 Interior Color: Jet Black Highway MPG: 23 Drivetrain: RWD Transmission: 6-Speed Automatic Engine: 5.3L V8 16V GDI OHV Car Features Hot Car Deals! 2018 Porsche Macan Sport Edition 2019 Mazda CX-9 Grand Touring 2019 Audi Q8 3.0T Prestige 2019 Mazda CX-9 Touring 2016 Chevrolet Tahoe LT 2013 Toyota Corolla LE 2019 RAM 1500 Classic Warlock 2016 Acura MDX 3.5L