The new Upcoming Cars in 2011 Mercedes-Benz G-Class provides two different levels of power with the 5.0L V8 engine of the G500, and the G55 AMG with a hot rod style 5.5L V8 engine. The MSRP for the G500 is $104,000, and $122,700 for the G55 AMG. Both types of G-Class vehicle average 11 mpg for city driving, and 15 mpg for highway driving.