The 2007 Ford Shelby GT500 is available as a 2-door, 4-seat coupe. Starting at $45,755, the 2007 Ford Shelby GT500 Convertible 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 21-mpg on the highway. The top of the line 2007FordShelby GT500Coupe , priced at $ 40,930 , 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 21-mpg on the highway.