Answers

Divide miles driven by gallons used.

fill-up and note milage, drive for x amount of miles, go back and fill-up again and note how many gals. subtract new milage from old and do the math.

ex: 200 miles driven divided by 10 gals used would equal 20 MPG

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you can do it the way the other person answered or if you have a trip odometer-do this-the next time you fill up with gas-reset the trip odometer back to zero at the time you fill the tank-and then wait until the next time you fill up-look at the pump or on your receipt and see how many gallons of gas it took to fill your car up-then check the mileage on the trip meter-then take that mileage and divide it by the gallons used to fill up the car and just like the last person said and it will give you the mpg your car has used!-so miles driven divided by gallons used = mpg.

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