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I cant speak for other cars, but Honda turns the alternator off and on by the ELD, so its on for the first 2 minutes or so of running, then when the battery voltage falls below 12.5 volts. Swapping out to a deep cycle battery and trickle charging should net the best results on any Honda. As an Insight owner and a slightly larger lead acid starter battery the results for improved mpg was for 15 for 7 miles or so, then it started to go down.
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