Porsche unveils plug-in hybrid concept

Forget a one-two punch – it's a hat-trick of hybrids for Porsche at the 2010 Geneva Motor Show.
Having already introduced the Porsche 911 GT3 R Hybrid with flywheel KERS (see article) and the Cayenne S Hybrid (see article), now the company has revealed a plug-in hybrid Porsche 918 Spyder concept car.
This exciting two-seat model is [...]
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