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Try some fuel system cleaner. Chevron Techron concentrate or Gumout Regane are two of the better ones (some cheaper ones are not all that effective).
Also, one of the biggest drains on fuel economy is tire pressure. Check your car's tire pressure. 33 PSI for each tire is a good balance of fuel economy and ride.
Finally, with your car's mileage, it is probably coming up on it's first tuneup soon. New Sparkplugs can improve fuel economy.
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