The 2018 GMC Yukon is available as a 4-door, 7-seat sport utility. Starting at $49,100, the 2018 GMC Yukon SLE 4x2 is powered by a 5.3L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated 16-mpg in the city and 23-mpg on the highway. The top of the line 2018GMCYukonSLT Standard Edition 4x4 , priced at $ 57,400 , is powered by a 5.3L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 16-mpg in the city and 22-mpg on the highway.