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Old 04-01-2011, 05:09 PM   #9 (permalink)
Weather Spotter
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Join Date: Nov 2009
Location: Midland MI, USA
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Max - '14 Ford C-Max SEL
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Not sure, I know it speeds up my warm up times by about 20-30% (depending on how cold it is out) but I have to admitt the rational for it was more user comfort then MPG.
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