Why Does the Fuel Gauge Show More Mileage as You Drive?

1 Answers
JasonFitz
07/29/25 11:26am
The reasons why the fuel gauge shows increasing mileage: 1. Before refueling, the gauge displays the estimated range based on the average driving speed. 2. Immediately after refueling, the gauge shows the maximum range at the average speed from stationary to moving. 3. After driving for some time, the gauge displays the maximum range at the current driving speed. 4. When the fuel pump is operating, a negative pressure forms in the fuel tank, reducing its effective volume and causing the fuel level to appear higher. Additionally, thermal expansion of gasoline due to temperature increases contributes to this higher reading. When the temperature drops or the fuel tank is opened, pressure is released, and the fuel level decreases accordingly. Therefore, such display discrepancies are normal phenomena.
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