Redpoint5, it's common in Honda Insights for the IMA system to function weirdly if the engine bay grounds are poor. It won't necessarily throw a CEL either; sometimes you'll just see the battery level do a "recalibration" or the IMA light come on instead. Sometimes lean burn functions poorly, with a rough or stumbling engine. I agree with you 100% that the cables themselves were not the source of the energy loss, but bad grounds can have a wide variety of symptoms which computers may not recognize.
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