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 2004 Mercedes-Benz S-Class AWD, 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.