What is the primary advantage of filling the fuel tank at the end of the work shift?

Filling the fuel tank at the end of the work shift primarily reduces the risk of condensation forming in the tank. When a tank is only partially filled, the empty space can create conditions conducive to condensation, particularly when there are temperature fluctuations. This condensation can mix with the fuel, leading to water entering the fuel system, which can cause operational issues, such as engine performance problems or even damage. By filling the tank completely, you minimize the air space within it, thus significantly decreasing the potential for moisture accumulation.

While other options may have their merits, they do not address the critical concern of maintaining fuel quality and equipment reliability in the same way.