Why is the average fuel consumption high after refueling?

[Hannah]

After refueling a car, there is usually a noticeable increase in fuel consumption. As speed, road conditions, and mileage increase, the fuel consumption tends to return to normal. Below are some relevant details about car refueling: 1. Maximum and reasonable fuel tank capacity: Generally, the capacity marked on an ordinary fuel tank is not the maximum volume but the maximum reasonable volume. For example, if a fuel tank is labeled as 60L, it might actually hold up to around 70L when completely full. Refueling up to 60L is within a reasonable range, providing sufficient space for fuel expansion due to temperature increases, thereby ensuring the safety of the fuel tank during use. 2. Safe fuel tank: The standard for the amount of fuel added cannot be determined based on the rated capacity of the fuel tank. A car fuel tank is a container, not a measuring device, and thus cannot be used as a basis for judging measurement accuracy. According to the requirements of national mandatory standards, the rated capacity of a car fuel tank should be controlled at 95% of its maximum safe capacity.