The alternator is spinning away anyways making energy and storing it in the battery. The system supposedly uses very little energy, someone mentioned as much as one headlight. Are you saying you get worst mileage during the night when all your headlights are on and afraid of burning out your alternator in the process?
Lets say the system gives you a 20% increase in mileage like some have claimed, I can't see a little drain on the alternator being a problem. IMHO.
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