The 2015 Mercedes-Benz GLK-Class is available as a 4-door, 5-seat sport utility. Starting at $39,900, the 2015 Mercedes-Benz GLK-Class GLK 350 AWD is powered by a 3.5L, 6-cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 25-mpg on the highway. The top of the line 2015 Mercedes-Benz GLK-Class GLK 250 BlueTEC AWD, priced at $39,400, is powered by a 2.1L, 4-cylinder engine mated to an automatic transmission that returns an EPA estimated 24-mpg in the city and 33-mpg on the highway.