Do you want to figure out how to figure yours out. a 20 year old car nothing is going to be average. to get it better lose some weight in the car. meaning don't carry 500 lbs of stuff you don't need. the less it weights the less the engine has to work which saves gas use. fill your tank normal till the pump shuts off and don't pull the handle to add more fuel. then write down the mileage. drive the car 200 miles. fill the tank again the same way. then figure out the miles you drove and how much gas you put in the tank. if you drove 200 miles and used 10 gallons you get 20 miles to the gallon. doing a tune up and checking your air in the tires can increase the mileage. good idea to check it first before doing the tune up to show it did some good. I did a tune up once and got almost 5 more miles to the gallon after
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