Colin I have spells where I wouldn’t risk driving so I’m grateful they can step in and help out. They’ve just got in the habit of leaving me to refuel it mainly as I have a fuel card through my business so I still fill up whenever it’s needed.
I’ve never found any cars fuel gauge to be accurate, the only way to tell how much is left in the tank in the real world is to try and wait until it starts to platter and make a note of how many miles it did.
most modern cars should have about 60 miles left.