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I've read somewhere on this forum that Hondas have been doing intelligent alternator control since at least the 1980's. Your car may be one step ahead of you.
Also, if you have a hybrid, you can disable the DC/DC converter and deep-cycle the 12V battery. Grid charge at home to save gas. The savings will be smaller, though, because the hybrid spends very little gas on 12V charging anyway.
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