Size the 2013 Porsche Cayenne up as what it is--a big, high-performance SUV--and you're not likely to have very high expectations about fuel efficiency. But you might be pleasantly surprised; especially in Diesel and Hybrid form, the Cayenne could be called responsible, at least in some circles.
The new Cayenne Diesel factors in at an excellent EPA-rated 19 mpg city, 29 highway The Cayenne V-6 and S Hybrid (20 mpg city, 24 highway) models are better than many of the alternatives, too, particularly when you factor in on-road performance capability.
Base Cayenne V-6 models with the standard manual transmission rate at 15 mpg city and 22 mpg highway according to the EPA. The optional eight-speed automatic improves the score to 16/23 mpg, for a combined rating of 19 mpg.
The Cayenne S slots between the two despite the extra 100 horsepower, rating 16 mpg city, 22 mpg highway, and 18 mpg combined. The Turbo's massive 500 horsepower output is only marginally thirstier, getting a 15/22 mpg rating for 17 mpg combined.