The 2013 Ford Shelby GT500 is available as a 2-door, 4-seat coupe. Starting at $54,200, the 2013 Ford Shelby GT500 Coupe is powered by a 5.8L , 8 -cylinder engine mated to a manual transmission that returns an EPA estimated 15-mpg in the city and 24-mpg on the highway. The top of the line 2013FordShelby GT500Convertible , priced at $ 59,200 , is powered by a 5.8LL , 8 - cylinder engine mated to a manual transmission that returns an EPA estimated 15-mpg in the city and 24-mpg on the highway.