Crazy difference in diesel prices by stations within 100 yards of each other

If we’re on a longer pull and wanting to make time I’ll look up on Gas Buddy and find the station nearest the cheap one thats .05 to .10 more expensive. Guaranteed there will be no lines. I call it the convenience tax.
Diesel is 3.23 down the street….. but I can go 15 miles south to CA and I’ll bet it’s well north of $6.