The 2009 GMC Yukon is available as a 4-door, 9-seat sport utility. Starting at $41,765, the 2009 GMC Yukon SLE1 w/3SA 4x4 is powered by a 5.3L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated 14-mpg in the city and 20-mpg on the highway. The top of the line 2009GMCYukonCommercial Fleet 4x4 , priced at $ 41,765 , is powered by a 5.3L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 14-mpg in the city and 20-mpg on the highway.