02-06-2013, 11:23 PM
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#9 (permalink)
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Batman Junior
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
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Yes, cold weather could easily be the culprit in a 4 mpg drop.
But FYI, I've had a vacuum leak before that significantly dropped the mileage on my Firefly (Metro) without setting a code/check engine light.
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