Different people measure their gas mileage differently. Only one method is accurate. It is as follows:
1) Fill the tank to a specific point Every.Single.Time. Some use the point where the pump shuts off, others use the second pump shutoff, others dribble in until the gas level is up in the filler pipe. Any method is correct, but the exact same method must be used on all fillups. It's best to fill at the same pump in the same gas station so the vehicle is always in the same position while filling.
2) Record amount of gas and trip odometer reading. Reset the trip odometer.
3) Repeat.
There will still be variation in how full you fill the tank, so you need to average over several fills to get a reliable mileage.
Many vehicles have a gas mileage readout. Some are more accurate than others.
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06 Canyon: The vacuum gauge plus wheel covers helped increase summer 2015 mileage to 38.5 MPG, while summer 2016 mileage was 38.6 MPG without the wheel covers. Drove 33,021 miles 2016-2018 at 35.00 MPG.
22 Maverick: Summer 2022 burned 62.74 gallons in 3145.1 miles for 50.1 MPG. Winter 2023-2024 - 2416.7 miles, 58.66 gallons for 41 MPG.
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