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It never affected my economy, but an exhaust crack DID make my idle go crazy. It would stumble along at 300 rpm and then surge to 2000 rpm. It's a common failure on the 90's Civics, so parts were plentiful and I replaced the whole thing.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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