The 2013 GMC Yukon is available as a 4-door, 7-seat sport utility. Starting at $41,760, the 2013 GMC Yukon SLE 4x2 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 2013GMCYukonDenali 4x2 , priced at $ 56,685 , is powered by a 6.2L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 14-mpg in the city and 18-mpg on the highway.