The states on that list include New York, Michigan, Arkansas, Mississippi, Oklahoma, Ohio, Colorado, Missouri, Iowa, Virginia, Wisconsin, Kansas and Kentucky.
Keep in mind though that prices are not in any way shape or form set at the state level. This could just mean that one small region of the state has that price while the major metro areas where 95% of the states population live are 250% higher still.
Gasoline / Diesel taxes vary pretty widely from state to state. Taking from either end, gas in Alaska is taxed at 14.6 cents per gallon, while California's gas tax is more than quadruple that at 61.2 cents. The gap is even bigger for diesel.
Maybe this is a semantic critique, but the assertion that prices are not set at the state level seems a naive one. They're not "set" at the federal level either, but taxes bear on the price significantly at both levels, though more uniformly at the latter.
Do you have anything to back this up?
It's conjecture.