The 2009 Ford Shelby GT500 is available as a 2-door, 4-seat coupe. Starting at $47,950, the 2009 Ford Shelby GT500 Convertible is powered by a 5.4L, 8-cylinder engine mated to a manual transmission that returns an EPA estimated 14-mpg in the city and 20-mpg on the highway. The top of the line 2009 Ford Shelby GT500 Coupe, priced at $43,125, is powered by a 5.4L, 8-cylinder engine mated to a manual transmission that returns an EPA estimated 14-mpg in the city and 20-mpg on the highway.