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Yeah, as s2man said, more car manufacturers are going to this system to increase fuel economy. All the hybrids do it, and conventional engines will do it soon enough. There are problems though. For instance, there is no coolant being pumped through your heater core, so after a while it starts blowing cold air in the winter (a annoying problem for me while P&Ging). The Prius remedies this with an electric coolant pump that kicks in to circulate while the engine is off. There are also problems if the car is using conventional power steering instead of the newer cars that use electric assist power steering... Theres more, I just can't think of them atm.
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