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Say your going 1000miles, say you get 20mpg-, size of the gas tank dont matter/ so the price of gas is 1.50$/gallon... you divide 1000/1.50=66gallons... 66gallons x @1.50/gallon =99$ the gas mileage. fill your tank up- say you have an 18gallon tank.. reset the trip odometer/ drive until you reach empty!, city/and or highway- then divide the miles you've drove by the full 18gallon tank you have used.. so 317 miles, on 18gallons.... = 17.6 MPG

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16y ago

What else can I help you with?