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It could be caused by a variety of things, and if i were you, just to get a little jump start on things i would run to auto zone or something and get a free diagnostics check on their computers. Its free, and its never a bad thing. I would have them check everything even alternator charging and all the good stuff.

Im just saying this because well, the possibilities are wide open with a gas mileage problem, just one little thing not working right could cause that.

Also running fuel treaters through all the time is not good for the powertrain. Those are meant to be used once in a great while..
 
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