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-Wait until your fuel meter is exactly on one of the white markings.

-Write down the current odometer reading.

-Find out how many gallons your tank holds (lets say 10 gallons).

-Drive around like you normally would, watching the fuel meter.

-When it has gone down exactly 1/4 of the way (indicated by the number of white marks, if there are 8 marks, wait until it has gone down two marks) write down the current odometer reading.

-Subtract the first reading from the second reading.

-Since the tank holds 10 gallons, 10/4 is 2.5, so in this time, you used 2.5 gallons of gas. But we're trying to find out how far you went on one gallon.

-So divide the result of subtracting the two reading by 2.5

-Divide this result by 2.5 and you should have your MPG!

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Q: How do you find the average mpg for your car?
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