Porsche's sportscar probably take the EPA by surprise, since their ground-ripping performance doesn't get in the way of great fuel economy.
The 2011 Cayman comes in base and S versions, and both have highway gas mileage that nears 30 mpg. The base Cayman gets an EPA-rated 20/29 mpg with its dual-clutch transmission, which the agency rather oversimplifies as an "automatic." With the six-speed manual instead, the Cayman sags a bit but still finishes with a 19/27 mpg rating.
The Cayman S is more powerful, but with the PDK dual-clutch gearbox, it carries the same fuel-economy rating as the base car. The manual Cayman S loses one more mile per gallon, with its 19/26 mpg score.Porsche hasn't said hybrids or diesels are in the Cayman's future, but the sportscar maker is dabbling in gas-electric drive with its Cayenne SUV--and with its staggering 918 concept supercar.