Hubby was in the army and then was a firefighter for 33 years. He is OCD about gas in the car. I will run it to the red line but anything close to 1/4 of a tank deserves a fill-up in his view.
I know you aren't talking about a shortage of money but that was the case of my teenagers running out of gasoline. I tried to drill it into them when they called me to come get them from wherever because the tank was empty. It costs exactly the same to drive with a full tank as it does with an eighth of a tank (or a sixteenth).