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If your mpg was "not bad and now really bad", an oil change can't 'hurt', but I doubt it will be a treatment or fix...
Assuming your driving habits/routes/conditions have not changed appreciably from the 'not bad' period to 'now', some other things may have changed or something may be amiss.
And, as Terminator suggested, add your model year, engine, trans, miles, general location, etc., either in your Sig or in a post.
Back at the Winter Ranch, the brutally cold weather of late is not conducive to good mpg.
GL, mD
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