At speeds up to 86 mph, the engine will shut down, only to be restarted when the driver asks for torque by stepping on the gas pedal.
Mark Gillies -
Car and Driver - Feb. 24, 2009
Hm... the numbers are low but I like the high speed Auto-Stop. 
--Ed.
Two years ago, Porsche unveiled a prototype of its first hybrid, a Cayenne V-6 with a single electric motor slotted between the engine and automatic transmissions. This went against the prevailing power-split hybrid wisdom practiced by Toyota and Ford, whereby a gasoline engine interacts with a pair of electric motors to form a continuously variable transmission. Porsche says two advantages of this parallel system are that it enables the Cayenne to retain its conventional all-wheel-drive system and its towing capacity.
Supercharged Electrons
Porsche has now shown us the production Cayenne hybrid, powered by the Audi S4s 333-hp, 3.0-liter supercharged V-6 engine instead of a Volkswagen 3.6-liter V-6. Mated to a 52-hp electric motor, this gives a maximum output of 374 hp, enough grunt for a 0-to-60-mph time of 6.4 seconds, just 0.4 second slower than the V-8powered Cayenne S. An eight-speed automatic transmission will take the place of the six-speed unit on the prototypes we drove. (This powertrain will also find its way into the Panamera sedan.)
Like many hybrids, the Cayenne can drive solely on electric power, in this case up to a speed of 30 mph for the most feather-footed drivers. To enable efficient regenerative braking to charge the 288-volt nickel-metal-hydride battery, Porsche locks up the torque converter very early, but had to..
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Linear Mode
