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a good accurate way is ti fill it up, all the way up, reset your trip, and then drive, when you go to refill you do this: say you went 290 miles, and to fill it up it was 17.6 gallons, divide 290 by 17.6 thatll give you the exact mpg, so you dont have to guestimate how much gas you have left in your tank, providing that each time you fill up you put the same (or close to it) amount in the tank to fill eer up
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