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Old 08-29-2011, 02:21 PM   #73 (permalink)
ConnClark
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Das Schlepper Frog - '85 Mercedes Benz 300SD
90 day: 23.23 mpg (US)

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Most car AC units kick on and off based on the cooling load. So I would guess that you switching from 4 down to 2 would reduce fuel consumption caused by the AC.
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