The 2017 Porsche 718 Cayman is available as a 2-door, 2-seat coupe. Starting at $53,900, the 2017 Porsche 718 Cayman Base is powered by a 2.0L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 21-mpg in the city and 28-mpg on the highway. The top of the line 2017Porsche718 CaymanS , priced at $ 66,300 , is powered by a 2.5L , 4 - cylinder engine mated to a manual transmission that returns an EPA estimated 20-mpg in the city and 26-mpg on the highway.