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Old 01-11-2011, 04:26 PM   #130 (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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So just a piece of cardboard with the aluminum foil facing the engine? If it is that easy I just might make one

What MPG gains would you say it gets you or is the point to speed warm up?
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