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To calculate average miles per gallon, fill up your gas tank and reset your trip odometer. Drive the car until you need to refill the tank. Note the number of miles shown on your odometer and divide this by the number of miles that you have driven. This gives you the average miles per gallon for the trip. Source: http://www.christianpf.com/how-to-calculate-mpg/, http://www.ehow.com/how_4484159_calculate-miles-per-gallon.html
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