The 2010 GMC Yukon is available as a 4-door, 9-seat sport utility. Starting at $42,080, the 2010 GMC Yukon SLE 4x4 is powered by a 5.3L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 21-mpg on the highway. The top of the line 2010GMCYukonCommercial Fleet 4x4 , priced at $ 42,080 , is powered by a 5.3L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 21-mpg on the highway.