First make sure the tune up is in good order. Then be sure tire pressures are correct. Incorrect tire pressure is a common reason for loss of mileage. Some tires are also rated to a higher psi, be sure to read the sidewall to see what the manufacturer suggests. You could possibly be due for a new oxygen sensor as well, I have seen them cause mileage drops before. Driving habit is another biggie, accelerate slowly and use light pressure on the gas pedal, this will help out
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Wednesday, February 17th, 2010 AT 7:37 AM