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"The plug-in hybrid drivetrain, a first for Porsche, can move the car 15.5 miles on battery power alone. But is the mileage figure all smoke and mirrors?"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/green-tech/transportation/blogs/porsche-918-spyder-offers-718-horsepower-zero-to-62-in-32-seconds-an>