The 2013 GMC Yukon Hybrid is available as a 4-door, 7-seat sport utility. Starting at $54,145, the 2013 GMC Yukon Hybrid Base 4x2 is powered by a 6.0L, 8-cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 23-mpg on the highway. The top of the line 2013 GMC Yukon Hybrid Denali 4x4, priced at $64,805, is powered by a 6.0L, 8-cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 23-mpg on the highway.