The 240 hp diesel engine allows the new Cayenne to be the most efficient variant yet by a long shot. The Cayenne diesel is rated at a combined 25.3 mpg (U.S.) on the European cycle. The 405 lb-ft of torque motivates the Cayenne to 62 mph in 8.3 seconds with a top speed of 133 mph. The 25.6 gallon fuel tank gives the Cayenne a bladder-busting range of 620 miles. Like its siblings, the Cayenne is only available with a 6-speed automatic transmission.
Source: Autoblog Green