The 2008 Mercedes-Benz CLS-Class is available as a 4-door, 4-seat sedan. Starting at $67,950, the 2008 Mercedes-Benz CLS-Class CLS 550 Coupe is powered by a 5.5L , 8 -cylinder engine that returns an EPA estimated 14-mpg in the city and 21-mpg on the highway. The top of the line 2008Mercedes-BenzCLS-ClassCLS 63 AMG Coupe , priced at $ 93,550 , is powered by a 6.2L , 8 - cylinder engine that returns an EPA estimated 12-mpg in the city and 18-mpg on the highway.