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So I was driving to work today and I was at the top of a hill so i pulled it out of gear and started coasting. I always drive with my window all the way down but i keep my sunroof shut well i started coasting and i could see the speedo slowly go down so i rolled my window up and then the speedo started going back up slowing i didn't think that with the window down i was causing that much drag. Anyway I was wondering how efficient would it be to hook a 12 volt motor to the compressor and drive with the window up would It help or just make the alternator draw more hp. Has anyone tried this here.. I really haven't been able to search around yet. Thanks for any input!
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