When you're sitting at a stoplight or stuck in traffic—and you're lucky enough to be behind the wheel of a new 2010 Porsche Panamera or 2011 Porsche Cayenne—you might notice the engine ever so smoothly shut off. Yes, it's supposed to do that; the feature is called Auto Start Stop. But unless you've driven a hybrid, like the Toyota Prius or Ford...

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That's umm odd. Why would anyone want that? What happens when it fails to start? Then your a sitting duck on the highway haha.