What is the reason for the average fuel consumption number on the dashboard not moving?

[Aubrey]

The reasons why the average fuel consumption number on the dashboard does not move: Fuel float problem: For some older vehicles, the fuel float may malfunction. The fuel float is essentially the fuel level sensor. You can check if the fuel level sensor connector on the fuel tank is loose and observe whether there is any sticking during the sliding process of the fuel level sensor. Fuel gauge circuit issue: If the fuel level sensor is functioning properly, you need to inspect the fuel gauge circuit on the car dashboard. Use a multimeter and a pin to locate and test the corresponding fuel gauge circuit on the dashboard. The fuel gauge displays the amount of gasoline in the car. It is important to note that when the fuel gauge needle falls below the red line and starts to alarm, even though the car can still run for 30-40 kilometers, you should not wait until the fuel level alarm sounds to refuel.

[JudahFitz]

My car has nearly 20,000 kilometers on it. Last week, I suddenly noticed the average fuel consumption display was stuck at 7.5 and didn't change, which scared me into rushing to the dealership. The technician diagnosed it as a system software malfunction using the computer and restored normal operation after resetting the trip computer. The service guy mentioned that these digital dashboards are prone to freezing, just like when a smartphone lags and needs a restart. He advised paying attention to changes while driving; if the fuel consumption figure remains unchanged over several tanks of gas, it's likely an issue with the trip computer's calculation module, and prompt maintenance is needed to prevent other functions from being affected.

[PenelopeDella]

As an experienced driver, I've encountered the fuel gauge getting stuck several times, and the reasons can be quite varied. The most common scenario is when the car's computer data gets reset after a battery disconnect, requiring driving dozens of kilometers for it to recalculate and refresh. Another issue is sudden braking causing poor sensor contact, which can freeze the data—I experienced this after a rear-end collision once. Nowadays, newer cars rely on electronic circuits, making them prone to signal transmission issues due to connector oxidation after rain. If the gauge remains unchanged even after highway driving, it's advisable to check the wiring harness connectors behind the dashboard.

[McArthur]

Just bought a used car and found the average fuel consumption stuck at 10.2 on the highway, even after resetting the trip meter. An experienced mechanic taught me a practical method to check: manually record the actual fuel consumption over three full tanks of gas and compare it with the dashboard data to determine if there's a system malfunction. It turned out that the fuel flow meter in the tank was stuck. After replacing the assembly, the dashboard resumed normal updates. Such issues should be addressed promptly to avoid long-term incorrect data affecting driving habits.