Why does the displayed mileage vary when the fuel tank is full?

[AndersonRose]

Because the estimated range fluctuates significantly, it is normal to see different readings when refueling at different gas stations, and variations also occur during normal driving. The range is calculated by the vehicle's computer based on factors such as current fuel level, recent fuel consumption, current driving speed, road conditions, load, etc. It is highly influenced by external factors like road conditions and can vary greatly, serving only as a rough estimate. Therefore, the range should only be used as a reference. Additional tips for fuel efficiency: 1. Replace spark plugs if they are worn or damaged: Spark plugs use high-voltage electricity to ignite the air-fuel mixture. If they are damaged, the ignition energy decreases, causing uneven combustion, slower acceleration, and increased fuel consumption. Worn spark plugs also reduce ignition energy, leading to slower acceleration and significantly higher fuel usage. 2. Pay attention to fuel quality and clean carbon deposits regularly: Many drivers overlook fuel quality. Poor-quality gasoline increases carbon buildup, which roughens the intake manifold walls, affecting air intake and mixture quality, leading to a sharp rise in fuel consumption. Therefore, fuel quality should not be neglected, and carbon deposits should be cleaned every six months. 3. Incorrect engine oil usage increases fuel consumption: Too much oil can cause it to mix with combustion, leading to incomplete fuel combustion, carbon buildup on spark plugs and mufflers, increased fuel consumption, slower acceleration, and reduced power. Too little oil increases friction between engine components, causing overheating, reduced power, and higher fuel consumption.

[RiverAnn]

The variation in displayed range after a full tank is primarily because the vehicle's onboard computer calculates remaining distance based on recent average fuel consumption. Having driven many cars, I've consistently observed significant fluctuations in this number. For instance, last time I was stuck in city traffic with high fuel consumption, it showed 400 km after refueling; a few days later on the highway with better mileage, it indicated 500 km at next fill-up. This directly correlates with driving habits – aggressive acceleration and braking increase consumption, shortening the displayed range. Maintaining steady speeds, highway driving without AC or light loads makes the system assume better efficiency, showing longer range. Weather also plays a role – cold winter temperatures thicken fluids, reducing combustion efficiency and potentially decreasing range display. Proper maintenance matters too – underinflated tires increase rolling resistance and consumption, affecting post-refuel range predictions. Essentially, this isn't malfunction but dynamic system adjustment, reminding you to optimize driving habits for fuel economy.

[DeAdrian]

I can relate to this deeply as someone who frequently drives on highways. The difference in the displayed mileage after filling up the tank mostly stems from changes in average fuel consumption. The system estimates based on your driving data from the past 50-100 kilometers. If you've just switched from city driving to highway driving, the fuel consumption drops, and it will show a longer range. I've noticed that driving at a constant speed is more fuel-efficient than stop-and-go city driving, naturally resulting in a longer remaining distance. Using the air conditioning or other electrical devices in the car consumes energy, which also increases fuel consumption and reduces the displayed range. Different road conditions, such as hilly terrain or strong wind resistance, prompt the computer to adjust its predictions in real-time. Seasonal effects are significant too—running the AC in summer increases fuel consumption, potentially reducing the remaining range by 20-50 kilometers compared to usual. Load is another factor; carrying cargo in the backseat or having a full car increases weight and rolling resistance, raising fuel consumption and shortening the displayed range. Battery aging can also make the system less accurate. Maintaining steady driving habits without sudden acceleration, checking tire pressure, can help stabilize this number. Remember to perform regular maintenance and use high-quality oil to optimize fuel consumption calculations.

[JasonAnn]

The varying distance displayed after a full tank is due to the vehicle's computer dynamic calculation. It estimates the remaining range based on average fuel consumption. For instance, I've noticed the numbers always change when driving in different environments. If you've just driven on the highway with low fuel consumption, the system predicts a longer distance; in city stop-and-go traffic with higher consumption, it shows a shorter range. Driving speed significantly affects this – maintaining 90 km/h is more fuel-efficient than 120 km/h, extending the range. External factors like wind direction or temperature also play a role; colder weather reduces fuel combustion efficiency, decreasing range. Load variations, such as carrying heavy luggage, increase engine burden and fuel consumption. Underinflated tires can slightly raise consumption and affect predictions. The system updates every few seconds to reflect real-time conditions. This isn't a malfunction but an intelligent reminder – maintaining smooth acceleration and avoiding high-speed excess is recommended. In short, the computer simulates your usage patterns, and paying attention to real-time adjustments can make predictions more accurate.