GM has redesigned the popular Yukon & Yukon Denali to make them more competitive in the full-size SUV market. The exterior styling has been tightened up for a more contemporary look, while the interior has been updated with improved materials and build quality. New optional features include head curtain airbags, power liftgate, 20-inch alloy wheels, rear camera system, and 2nd row folding seats. Stabilitrak(R) stability control is standard. The standard 5.3L V-8 has Active Fuel Management(TM), and can also run on E85 (85% ethanol/15% gasoline). Active Fuel Management(TM) allows the engine to run on 4-cylinders under light load conditions, for improved fuel economy.