2001 Chevrolet Cavalier Q&A

2001 Chevrolet Cavalier Question: Question regarding my son's car. He's complaining of very poor fuel ecomony?

I read quite a few blogs already; some almost make sense, other don't (I myself am a HD Diesel Mechanic, so therefore I not to easliy fooled). I drove the car myself an witness his complaint. The car has great accelration, doesn't run rough. It at times seem's that wants to be a little diffcult starting up (but it's not that noticable(I notice it, but the son doesn't). It has 3 codes in it P0440; P0137 (which comes twice; and is the last one regristered) & a P1137. Any idea's? -
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