How are you driving it?
I can get really good gas mileage if I drive like an old lady. But I don't, I always step on it, so my mileage sucks. Could be your problem.
Make sure your air filter is clean and has a LIGHT oil film. Normally when oil covers the MAF wire, the computer will pick it up as a problem if the wire gets a little too much oil.
If you haven't tuned your car in a long time, it might be time to try that too. You didn't say how many miles you've got on your car.
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