The 2015 Mercedes-Benz SLK-Class is a 2-door, 2-seat Convertible, available in 3 trims, ranging from the SLK350 to the SLK250. Upon introduction, the $57,650 SLK350 is equipped with a standard 3.5L, 6-cylinder, engine that achieves 21-mpg in the city and 29-mpg on the highway. An Automatic transmission is standard. The $43,950 SLK250 is equipped with a standard 1.8L, 4-cylinder, engine that achieves 22-mpg in the city and 32-mpg on the highway. A Manual transmission is standard.