I wouldn’t be upset or pity someone who doesn't refill the tank — I just wouldn’t go out of my way to help them again, like I would for someone who does refill

I wouldn’t be upset or pity someone who doesn't refill the tank — I just wouldn’t go out of my way to help them again, like I would for someone who does refill it. If you make a point of showing your appreciation when I do you a favor, I’m much more likely to do you more favors in the future.