From Porsche press: The Cayenne is powered by a 3.6-liter V6, up from the 3.2-liter of its predecessor. With both the manual gearbox and the Tiptronic S transmission, the 2008 Cayenne earns an EPA fuel economy rating of 14 mpg in the city and 20 mpg on the highway. Output is up commensurately: 290 horsepower and 273 lb.-ft. of torque. The results are felt immediately as the Cayenne now accelerates from a standstill to 60 mph (96 kph) in 7.5 seconds, a full second quicker than the original. Track-proven top speed is up from 133 mph (214 kph) to 141 mph (227 kph).
The Cayenne can be equipped with either a reinforced six-speed manual or six-speed Tiptronic S transmission. The manual features the Porsche Drive-Off Assistant, which automatically applies the brakes when the vehicle is sitting on an incline and the driver disengages the clutch.
Walking a delicate line, all Cayenne models must be more than a Porsche: they must be sport- utility vehicles. And inherent in the concept of an SUV is the ability to traverse many more surfaces than asphalt or concrete. To that end, all three Cayenne models come standard with Porsche’s all-wheel drive system: Porsche Traction Management (PTM).
Among the many standard features on all '08 Cayenne models are a push-button Sports mode and power rear liftgate which can be set to open to various heights.