The 2012 Mercedes-Benz CLS-Class is available as a 4-door, 4-seat sedan. Starting at $71,300, the 2012 Mercedes-Benz CLS-Class CLS 550 Coupe RWD Sedan is powered by a 4.7L , 8 -cylinder engine that returns an EPA estimated 17-mpg in the city and 25-mpg on the highway. The top of the line 2012Mercedes-BenzCLS-ClassCLS 63 AMG Coupe RWD Sedan , priced at $ 94,900 , is powered by a 5.5L , 8 - cylinder engine that returns an EPA estimated 16-mpg in the city and 25-mpg on the highway.