2015 GMC Yukon Denali 4WD with the 6.2-liter V8 engine is a luxury full-size SUV that combines high-end comfort with strong performance and towing capacity. Engine: 6.2L EcoTec3 V8 with direct injection and cylinder deactivation (Active Fuel Management).Power: 420 horsepower at 5,600 rpm and 460 lb-ft of torque at 4,100 rpm.Transmission: 6-speed or 8-speed automatic transmission (depending on the exact production date within the 2015 model year).Drivetrain: Autotrac 4WD system with 2WD, Auto 4WD, 4WD High, and 4WD Low settings.Fuel Economy: Approximately 14-15 mpg in the city and 21-22 mpg on the highway.Towing Capacity: Up to 8,100 to 8,400 pounds when properly equipped. Seating: Three-row seating for up to 7 or 8 passengers, featuring premium leather upholstery.Comfort: Heated and ventilated front bucket seats, heated second-row seats, and a heated steering wheel.Technology: 8-inch color touchscreen with IntelliLink navigation, Bluetooth connectivity, Bose premium 10-speaker audio, and available rear-seat Blu-ray/DVD entertainment.Convenience: Hands-free power liftgate, keyless start and entry, remote start, and power-folding second and third-row seats.Safety: Magnetic Ride Control suspension, forward collision alert, lane departure warning, rear cross-traffic alert, and side blind zone alert.