The 2013 Mercedes-Benz SL-Class is available as a 2-door, 2-seat convertible. Starting at $105,500, the 2013 Mercedes-Benz SL-Class SL 550 is powered by a 4.7L, 8-cylinder engine mated to an automatic transmission that returns an EPA estimated 17-mpg in the city and 25-mpg on the highway. The top of the line 2013 Mercedes-Benz SL-Class SL 63 AMG, priced at $145,800, 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 25-mpg on the highway.