The 2006 Mercedes-Benz CLK-Class is available as a 2-door, 4-seat coupe. Starting at $53,700, the 2006 Mercedes-Benz CLK-Class CLK 350 Convertible 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 27-mpg on the highway. The top of the line 2006Mercedes-BenzCLK-ClassCLK 500 Coupe , priced at $ 54,350 , is powered by a 5.0L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 17-mpg in the city and 25-mpg on the highway.