The 2009 Mercedes-Benz S-Class is available as a 4-door, 5-seat sedan. Starting at $89,350, the 2009 Mercedes-Benz S-Class S 550 RWD Sedan is powered by a 5.5L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated 14-mpg in the city and 22-mpg on the highway. The top of the line 2009Mercedes-BenzS-ClassS 65 AMG RWD Sedan , priced at $ 198,950 , is powered by a 6.0L , 12 - cylinder engine mated to an automatic transmission that returns an EPA estimated 11-mpg in the city and 17-mpg on the highway.