Sneaux next week [Historic snowstorm in southeast Louisiana on January 21, 2025]

... this is kind of the opposite of, say, a potential hurricane evacuation, no? In this current snow event, the emergency procedure is that you DON'T drive. Ergo, no need for additional gas.

EDIT: Or are you thinking of another angle altogether?
It's best to keep a gas tanks as full as possible. Condensation can form inside the tank on cold days like this.


https://www.illinifs.com/products-services/resource-center/item/managing-moisture-in-fuel-tanks