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[ From the beginning, my old man taught me to always refill at 1/4 tank or at very least look for a gas station at 1/4 tank. I only ignored this advice once in my driving lifetime and I very nearly ran out of gas in the middle of rush hour traffic. I was literally sputtering on fumes and my car engine shut off as I was coasting up to the refill station. Never again. ]

If your car or truck has a electric gas pump in the tank you never want to go below 1/8th of a tank because running the pump dry will cause extra wear an tear to the pump and it also uses the gas in the tank to lubricate and cool the pump parts.

My brother explained this to me when he replaced the fuel pump in my car.

That rule has never made sense to me. 1/8th of a tank is not dry. The inlet gets gas, which lubricates the pump. It is only when you are OUT of gas (or there is no gas getting into the pump) that it goes dry and is not being lubricated.

But I may be missing some nuance to the whole thing.