The 2013 Porsche 911 is available as a 2-door, 4-seat coupe. Starting at $137,500, the 2013 Porsche 911 Turbo (M6) AWD Coupe is powered by a 3.8L , 6 -cylinder engine mated to a manual transmission that returns an EPA estimated 16-mpg in the city and 24-mpg on the highway. The top of the line 2013Porsche911Carrera 4S (M7) AWD Cabriolet , priced at $ 117,530 , is powered by a 3.8L , 6 - cylinder engine mated to a manual transmission that returns an EPA estimated 18-mpg in the city and 26-mpg on the highway.