The 2011 Porsche Cayman is available as a 2-door, 2-seat coupe. Starting at $51,900, the 2011 Porsche Cayman Base is powered by a 2.9L , 6 -cylinder engine mated to a manual transmission that returns an EPA estimated 19-mpg in the city and 27-mpg on the highway. The top of the line 2011PorscheCaymanS , priced at $ 62,100 , is powered by a 3.4L , 6 - cylinder engine mated to a manual transmission that returns an EPA estimated 19-mpg in the city and 26-mpg on the highway.