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Joel (not verified)    November 25, 2018 - 10:48PM

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My Civic only has 30k miles and was getting down to 25 mpg. Then I discovered I put in a quart too much oil when doing oil change. Seems like car will be alright though. Took out the extra oil, replaced the plugs and air filter. It went up to 30 mpg. Next I will be replacing PCV valve, and am hoping for an incemental improvement...

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