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55k seems a little early but possibly new spark plugs, fuel filter, air filter. Is the car running rough at all?
With a Civic and with mild hypermiling it seems like a hardware issue (car isn't functioning well). I would start with the basics I listed above and work your way into the scarier stuff but 22-24mpg in a civic when you're actually TRYING to get good mileage seems WAY too low for it to just be your driving habits.
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2007 Honda Civic Ex
Second Goal = 50mpg
First goal = 40mpg Goal Achieved 3 tank average over 40mpg
Starting point 30mpg ready...... GO.
Last edited by Blue07CivicEX; 07-24-2008 at 05:12 PM..
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