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I have an 02 Civic EX I had ordered an intake with a bad fit. When i installed everything afterwards the check engine light was on for "emissions". After I drove it for about 10 miles or so the light went off. I assume the computer was resetting itself since the battery was disconnected. However since then the mile.
Since I took everything off and then reinstalled the factory box my gas mileage has gone way down (near 20 usually near 29-31). I am near my 4th refueling so bad gas is not in the picture and no check engine lights are on. Does anyone have an idea of what could be causing this or had similar issues?

 
Rep Power: 452

http://www.7thgencivic.com/forums/sh...d.php?t=226178

sorry man but there are too many threads on getting bad gas mileage or what to do to make it better. use the thread above to help you.