Porsches are known for the sound of their rippling horsepower under the hood, but the company's new gas-saving hybrid actually runs on batteries more than half the time -- leaving the driver with little more than the sound of the wheels on the road. Using a parallel full hybrid design developed with Volkswagen and Audi engineers, the prototype Cayenne S Hybrid relies on a combination of internal combustion and electric power to reduce C02 emissions and boost mileage from 14 mpg in the city to 24 mpg.
That's still only half what the Toyota Prius hybrid gets, but then again, it's an SUV. The company wants to improve mileage further by the time the Cayenne S Hybrid hits the market in 2010.
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