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The original Insight was a mild hybrid. I think that if a hydraulic hybrid is going to be justified (from an engineering standpoint) then it needs to exceed the performance of a full hybrid like the Plugin Prius or the Volt or any of the plugin hybrids now on the market.
The problem with a hydraulic hybrid is that it cannot be used like a plugin hybrid; which is the most efficient portion of driving one.
Even a comparison with the regular Prius would be useful. Does the weight and cost and energy storage capacity of this hydraulic system justify using it instead of an electric system like the Prius? Would using it result in better overall efficiency?
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