Buyers of the 2009 GMC Yukon Hybrid want to have their cake and eat it too. They're looking for a large, roomy and capable SUV but also demand fuel economy that won't break the budget or put them in bad standing with the neighbors. GMC's Yukon Hybrid delivers on this count, with an EPA-estimated 21 mpg city, 22 mpg highway--a full 50 percent better in the city than the standard Yukon with a 5.3-liter V-8--while maintaining a respectable tow rating of 6,000 pounds.