The context of the following conversation is Casey was 75% full in the tank, but Casey bought gas anyway.:
Casey says I'm such a nervous driver that I filled up at the gas station even though it was already 75% full..
The friend responds Why do you get afraid of running out of gas?.
Casey responds I wanted to drive to the state park and I don't know if there are fill stations on the way..
The friend responds Oh, that makes sense I guess but I do think the park has a gas station too..
Casey responds Oh, good because I am sure I'll fill up again once I leave there..
The friend responds Yes, if you are that nervous about running out, I am sure you will..