The 2007 Mercedes-Benz S-Class is available as a 4-door, 5-seat sedan. Starting at $85,750, the 2007 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 16-mpg in the city and 24-mpg on the highway. The top of the line 2007Mercedes-BenzS-ClassS 550 AWD 4MATIC Sedan , priced at $ 88,750 , is powered by a 5.5L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 22-mpg on the highway.