The 2011 Porsche 911 is available as a 2-door, 4-seat coupe. Starting at $135,500, the 2011 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 2011Porsche911GT3 RS 4.0 (M6) RWD Coupe , priced at $ 185,000 , is powered by a 4.0L , 6 - cylinder engine mated to a manual transmission that returns an EPA estimated 13-mpg in the city and 19-mpg on the highway.