The 2008 Mercedes-Benz SL-Class is available as a 2-door, 2-seat convertible. Starting at $129,300, the 2008 Mercedes-Benz SL-Class SL 55 AMG is powered by a 5.4L, 8-cylinder engine mated to an automatic transmission that returns an EPA estimated 12-mpg in the city and 17-mpg on the highway. The top of the line 2008 Mercedes-Benz SL-Class SL 65 AMG, priced at $187,200, is powered by a 6.0L, 12-cylinder engine mated to an automatic transmission that returns an EPA estimated 11-mpg in the city and 18-mpg on the highway.