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FWIW, uesterday I drove to work without my 12v charging in my Insight. To charge the 12v I currently have the IMA motor hooked to a 3 phase rectifier (70-300v AC to 70-300v DC) and that to a Meanwell power supply to step the 70-300v DC down to ~14v DC. The difference in fuel economy between driving to work Wednesday morning with everything charging, vs Thursday with it unhooked and just using the battery's capacity, was less than 1%.
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