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Something is amiss if you're getting 19MPG combined. I drive with a pretty heavy foot and average 21MPG in mostly city driving and have gotten 26-28MPG on long freeway slogs.
I'd do the usual fluids / filters / plugs / MAF cleaning and see where that gets you.
O2 sensors have a service life, usually 50-60,000 miles. So it isn't out of the question for them to have gone bad.
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