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Old 12-25-2014, 12:14 AM   #1 (permalink)
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air circulation button vs mpg

The air circulation button was mistakenly on throughout a recent trip.

How much difference might it have made in the mpg?

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Old 12-25-2014, 02:33 AM   #2 (permalink)
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Seems like it would make the car a hair more aero... I'm thinking a solid 0.00938% improvement at a given fan speed, assuming that setting did not also automaticly allow the a/c. However, if you would have been able to select a lower fan speed due to the passive flow, when on a vent setting, I'm thinking you're losing out by.... however much power it takes to spin the fan at one level higher... maybe 0.05% loss.
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Old 12-25-2014, 12:26 PM   #3 (permalink)
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The circulation fan would take some energy, and the alternator appeared to be charging the battery the whole trip, even though it already had a full charge from the start. I don't use a/c, and would have noticed if it had been on.
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Old 12-26-2014, 12:36 PM   #4 (permalink)
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It may have a nearly-zero impact on fuel-efficiency anyway.

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