The context of the following conversation is Casey was 75% full in the tank, but Casey bought gas anyway.:
Casey says I just fill up for the road. I was down to three quarters..
The friend responds There's no need to fill up right away..
Casey responds I know but I am afraid of running out in case of an emergency..
The friend responds You only work two miles away..
Casey responds Rather be safe in case of the impending apocalypse?.
The friend responds Oh, I ignore those zombies. They are quite harmless..