Re: Terrible gas mileage,
Gas can go bad in just a couple of months. With our truck, the tank is vented at the cap. This allow the tank to breath the outside air. This air has moisture and oxygen in it. The moisture will condense into water and lay in the bottom creating rust (or mixed with the alcohol in the fuel). Then the oxygen will blend with the fuel making it darker and smelling foul. All of with it will make the engine run poorly (poor mileage too). If the fuel cap was like the new truck the entire fuel system would last for several months without problems.
What I would do if the truck is running badly, topped off the tank the drive it until it is low on fuel then topped it off again and the problem will go away (providing nothing else is wrong with the engine).
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