The 2018 Mercedes-Benz CLS 550 is available as a 4-door, 4-seat sedan. Starting at $75,150, the 2018 Mercedes-Benz CLS 550 CLS 550 RWD Sedan is powered by a 4.7L, 8-cylinder engine mated to anautomatic transmission that returns an EPA estimated 18-mpg in the city and 26-mpg on the highway. The top of the line 2018 Mercedes-Benz CLS 550 CLS 550 AWD 4MATIC Sedan, priced at $77,650, is powered by a 4.7L, 8-cylinder engine mated to anautomatic transmission that returns an EPA estimated 17-mpg in the city and 25-mpg on the highway.