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Q: what would cause fuel economy to go down on 1993 Volkswagen Jetta

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My fuel economy seems like it is a lot less than it should be. a 4cyl jetta like mine should get at least 350 miles on a full tank but right now i'm only getting about 280 miles. I am going to try getting my spark plugs replaced and my tires rotated, but is there anything else I might want to try besides that?
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thanks! i'll try that, and since i was contemplating on upgrading my air filter to a short cam eventually, this helps influence my decision a little bit :)