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Originally Posted by JoeBob
As for cutting off the alternator output, how much gain can be derived thereby?
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A lot:
Plug-in Blackfly: going alternator optional nets +10% mpg
AndrewJ just did that to his Civic, and noted an even larger mpg boost.
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I wonder also about battery life...
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You wonder correctly. This will destroy a conventional starting battery pretty quickly, as you mentioned. So unless you have a supply of free or cheap batteries (with enough capacity), this mod makes no sense from a financial standpoint.