GMC Yukon 2005 Automatic The 2005 GMC Yukon XL Denali is a full-size, luxury SUV equipped with a 6.0L V8 engine, standard, and a high-end interior with leather seats. Performance and mechanical Engine: 6.0-liter V8 with 335 horsepower and 375 lb-ft of torque. Transmission: 4-speed automatic transmission. Fuel Economy: Estimated 12 MPG city / 16 MPG highway. Interior and features: Seating: Leather seats, 3rd-row seating, heated front seats, and heated outboard second-row seats. Infotainment: Bose premium sound system, in-dash 6-disc CD changer, and an optional rear-seat entertainment system. Convenience: Power-adjustable pedals, dual-zone automatic climate control, power windows, and a power sunroof. Standard features: Driver and passenger airbags, traction control, and child seat anchors.