Via my brother:

Which gas tank person are you?

– Never let it drop below 1/2 full. Heck, you might have to go somewhere, or Armageddon is coming.

– My little gas pump light’s not on; what me worry? Squeeze every drop outta that sucker. Besides, carrying around that gas costs mileage.

– Somewhere in between; usually around 1/4 and well before the light comes on, but neither really matters.

I am the last one; it gets to 1/4 and I’m at the station. Which reminds me….