KBB.com Brand Image Awards. Scores 22 Highway MPG and 15 City MPG! This GMC Yukon XL delivers a Gas V8 5.3L/325 engine powering this Automatic transmission. TRANSMISSION, 6-SPEED AUTOMATIC, ELECTRONICALLY CONTROLLED with overdrive, tow/haul mode and tap up/tap down shifting (STD), TRANSFER CASE, ACTIVE, 2-SPEED ELECTRONIC AUTOTRAC with rotary controls, includes neutral position for dinghy towing, TRAILER BRAKE CONTROLLER, INTEGRATED.*This GMC Yukon XL Comes Equipped with These Options *SUSPENSION PACKAGE, STANDARD Increased capacity, Premium Smooth Ride with Air leveler, 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 , TIRES, P275/55R20 ALL-SEASON, BLACKWALL, SUMMIT WHITE, SLT PREFERRED EQUIPMENT GROUP Includes Standard Equipment, SEATS, SECOND 60/40 SPLIT-FOLDING BENCH power release (STD), SEATS, FRONT BUCKET WITH PERFORATED LEATHER-APPOINTED heated and ventilated seat cushions, 12-way power driver and passenger seat includes 6-way power cushions, driver seat 2-position memory, 4-way power lumbar control and power recline (STD), REAR AXLE, 3.42 RATIO, LPO, ALL-WEATHER FLOOR MATS, (DEALER-INSTALLED)