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Old 10-26-2012, 10:02 AM   #5 (permalink)
PaleMelanesian
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Join Date: Dec 2007
Location: Texas
Posts: 2,321

PaleCivic (retired) - '96 Honda Civic DX Sedan
90 day: 69.2 mpg (US)

PaleFit - '09 Honda Fit Sport
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90 day: 44.06 mpg (US)
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EGR is a good suggestion.

Also, how's your exhaust manifold and/or O2 sensor? I had a crack in my manifold at the sensor port and it would sometimes idle high like you describe.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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