The 2011 Ford Shelby GT500 is available as a 2-door, 4-seat coupe. Starting at $48,645, the 2011 Ford Shelby GT500 Coupe is powered by a 5.4L , 8 -cylinder engine mated to a manual transmission that returns an EPA estimated 15-mpg in the city and 23-mpg on the highway. The top of the line 2011FordShelby GT500Convertible , priced at $ 53,645 , is powered by a 5.4L , 8 - cylinder engine mated to a manual transmission that returns an EPA estimated 15-mpg in the city and 23-mpg on the highway.