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

Here where I live, the is a Love's truck stop on one side of the highway and a QT truck stop on the other maybe 200 to 300 yards apart. There is anywhere from .60 to .90 difference is diesel pricing, Love's being the higher priced of the two. When QT first opened, I figured their pricing would go up after the grand opening, but it never has. Now Love's has a big sign at the entrances that says "NO big truck overnight parking unless you buy fuel".