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hi reneelcurry. that sounds a little low. whens the last time you have a tune up? spark plugs and wires. last oil and filter change? having old worn out spark plugs or even a dirty oil filter can effect driving performance. you also might want to check and make sure your tires are properly inflated.
 

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really the only other thing i can think of would be a bad or failing sensor. this could cause the car to add more gas to the motor than it actually needs. maybe the map sensor or iac? youd probably have to have someone take a look at he car. im not really sure how you would diagnose bad mileage, sorry. let us know what you find out
 
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