Survey time.
Your fuel tank is half full … is it time to find a garage and fill up … or do you just keep going because the other half tank got you this far?
@JohnPhilpin I usually just look at the gauge when I’m near a Costco and have time. If it's an orange-light emergency, I’ll get it wherever, but prefer to use the discount I’ve paid for if possible. But I don't panic before the light comes on.