All this regional pricing stuff is kind of a moot point for me.
For the most part while connected to the 5'er I'm filling up based on convenience not price.
Finding a station, usually a truck stop that gives me easy in and out access is the first criteria for stopping. Price is secondary.
I'm certainly not going to pass an easy access fuel stop to a tight hard to access station for the savings.
While every penny counts the cost difference of fuel between stations is a negligible amount in the overall cost of camping.
When disconnected I may seek price but while connected convenience is my first priority.