The 2021 GMC Yukon XL is available as a 4-door, 7-seat sport utility. Starting at $53,400, the 2021 GMC Yukon XL 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 20-mpg on the highway. The top of the line 2021 GMC Yukon XL Denali 4x4, priced at $74,100, 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 19-mpg on the highway.