If the alternator is spinning it will contribute to engine drag, even unloaded. @ 3mpg it isn't noticeable, but as you get higher in the distance per volume of fuel it becomes apparent. You may not ever see it, but your electrical system has a cold function so you may need to trick it even at 14.1v. I suggest a disconnect switch of some sort
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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