KBB.com Brand Image Awards. Scores 22 Highway MPG and 16 City MPG! This GMC Yukon delivers a Gas/Ethanol V8 5.3L/323 engine powering this Automatic transmission. WHITE DIAMOND TRICOAT, WHEELS, 20" X 9" (50.8 CM X 22.9 CM) POLISHED ALUMINUM, TRANSMISSION, 6-SPEED AUTOMATIC, ELECTRONICALLY CONTROLLED with overdrive, tow/haul mode and tap up/tap down shifting (STD).*This GMC Yukon Comes Equipped with These Options *SUSPENSION PACKAGE, STANDARD Increased capacity, Premium Smooth Ride with Air leveler, OPEN ROAD PACKAGE, (CF5) power sunroof, (U42) rear seat entertainment system and on SLT (IO6) Audio system with navigation, LICENSE PLATE FRONT MOUNTING PACKAGE, HD TRAILERING PACKAGE includes (GU6) 3.42 Axle Ratio, (JL1) Trailer brake controller, (Z85) Suspension Package and includes (NQH) transfer case, active, 2-speed with 4WD models , TRANSFER CASE, ACTIVE, 2-SPEED ELECTRONIC AUTOTRAC with rotary controls, includes neutral position for dinghy towing., TRAILER BRAKE CONTROLLER, INTEGRATED, TIRES, P275/55R20 ALL-SEASON, BLACKWALL, SUNROOF, POWER, TILT-SLIDING with express-open and close and wind deflector, SLT PREFERRED EQUIPMENT GROUP Includes Standard Equipment, SEATS, SECOND ROW BUCKET, POWER.* See What the Experts Say!*As reported by KBB.com: If you need no-compromises hauling and towing ability, along with a no-compromises, first-rate interior, the 2015 GMC Yukon and Yukon XL are just the ticket. That goes double for the high-end Denali models.