[nascarnation]

Two other advantages of topping up:

The fuel keeps the fuel pump cool (electric pump mounted in the tank), and running low in hot weather is not good for the pump.

Water vapor is more likely to freeze in very cold weather in a mostly empty tank.

[SaxxonWoods]

Thanks, that’s a good reminder. I’m also told running a gas tank to almost empty can cause crud in the bottom of the tank to go to the motor.