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Might want to start another thread on that.
It could be your driving style - my father-in-law gets low 40's to high 50's when he drives my car, and for the life of me I can't figure out how he does it. On the same trips I average 70+ doing nothing but driving at a constant speed (~the speed limit, even), and have pulled 100+ when I'm actively trying.
It could be a mechanical problem - bad compression? Clogged EGR? Brakes rubbing? Tires out of alignment?
It could simply be your driving conditions. Even the best drivers will get horrible economy in stop and go traffic, because any time you need to use your brakes, you're very effectively converting gasoline into brake dust. Compound that with the engine idling while you're not moving, and you're got a recipe for poor fuel economy.
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