Unfortunately, car trip computers are not always accurate. On average, a car’s reported miles per gallon (mpg) will be between 10 and 15% better than its actual mpg.
To find your car’s actual mileage per gallon, zero the trip odometer the next time you fill up your gas tank. Then, drive your car for a while. When you refill your gas tank, fill it all the way and note the number of gallons you put in your car. Use the miles on the trip odometer and the number of gallons of gas you use to calculate your car’s actual mileage.
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