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It is the volts really. If they stay in bounds the amps won't be pulled, as the battery won't overcharge then. So the alternator offers less resistance and you burn less fuel.
To go with the fall analogy; you need a certain height (voltage) to reach the speed (amps) that kills you (overcharge battery) when you land.
Overcharging the battery does not sound as bad as falling to your death, especially when served with a sandwich and a large beer...
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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