The 2010 GMC Yukon XL 1500 is available as a 4-door, 9-seat sport utility. Starting at $58,750, the 2010 GMC Yukon XL 1500 AWD is powered by a 6.2L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated 13-mpg in the city and 20-mpg on the highway. The top of the line 2010GMCYukon XL 1500Commercial Fleet 4x4 , priced at $ 44,330 , is powered by a 5.3L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated