The 2004 Mercedes-Benz S-Class is available as a 4-door, 5-seat sedan. Starting at $74,250, the 2004 Mercedes-Benz S-Class RWD is powered by a 4.3L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 26-mpg on the highway. The top of the line 2004Mercedes-BenzS-ClassAWD , priced at $ 77,150 , is powered by a 4.3L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 17-mpg in the city and 22-mpg on the highway.