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I changed my fuel filter on my 91 crx si, and then it started getting crappy gas mileage. Like 25mpg compared to 31. I looked around, and noticed i forgot to connect the line back up that goes into the charcoal canister thing. Check yours and be sure the lines are connected up to it properly. The one that was disconnected on mine was the one that comes out of the bottom of it(canister) and into the frame. Very easy to overlook and leave disconnected if you have removed it for any reason. This is just one of the many things that can cause crappy gas mileage.