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Originally Posted by oldtamiyaphile
I would tend to agree with John's hypothesis. The more you EOC the more voltage you loose, and that energy then has to come from the alternator. It takes around 7hp for a small car to cruise and an 80A alternator can output 1.5hp, if the alternator has a lot to do you can see that can be a big hit to economy.
When UFI got a battery twice as big as stock, my MPG went up by as much as 15%, I charge it at home and the alt has nothing to do for at least the first 140 miles.
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Yes. I believe it. I have to do a lot of voltage management to keep things healthy, including overnight charging - daily in winter with headlights but less in summer.
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If you've got a lightweight car with poor aero, I've found EOC to be ineffective.
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I disagree completely.