Rigjockey
In Gord we trust!
I think Effingham does that a lot being as it is the north/south, East /west route close to other states.It varies a lot - states do change their tax rates. Many times fuel stops will adjust their prices on either side of a state line to be close in price. If there's a big difference in tax rates, you can score a deal on cheap base price fuel - if you pay your own IFTA tax bill.