The 2009 GMC Yukon XL blends a rugged truck-based construction with premium amenities, and when properly equipped, a downright luxurious full-size SUV package. Three engine choices power the 2009 Yukon XL: a base 5.3 liter 310 horsepower V8, 6.0 liter 352 horsepower V8 and a 6.2 liter 403 horsepower V8. Fuel economy for the 2009 GMC Yukon XL ranges from 12 MPG city to 21 MPG highway.