That was awhile back: what has actually been happening is that Sheetz a regional chain goes c. $1.30 cents above my estimate of the state wholesale cost (to $2.99) every 10-12 days or so as part of the midwest’s price cycling. Yeah, the valley typically gets below $2.60, so that’s when to fill up, esp. if as you have done you’ve found a local station which has a deep valley.
At the start of my trip I had planned to visit a Meijer in Youngstown which consistently has had very low valleys, $2.02 according to both Gasbuddy and Google Maps, but Sheetz had done their sheet back to $2.99, again, and there is one a half mile from the Meijer. Drove up, $2.89 for regular, ANNND since my car needs premium it cost me $2.79 after my points discount (1 buck) and my M. credit card (-10 cents). They were the last station in the state to have a regular/premium spread of less than a dollar too, but no longer-used to be 60 cents before I moved here for good, sigh…