The 2003 Mercedes-Benz CLK-Class is available as a 2-door, 4-seat coupe. Starting at $49,950, the 2003 Mercedes-Benz CLK-Class Convertible is powered by a 3.2L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 27-mpg on the highway. The top of the line 2003Mercedes-BenzCLK-ClassBase , priced at $ 68,750 , is powered by a 5.4L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 17-mpg in the city and 24-mpg on the highway.