The Ill Annoy legislature is making noises about passing yet more gas taxes ASAP while prices are lower, to minimize people noticing. And I forget how many different blends we have to deal with around chi-pit because of the EPA micromanaging things, but it certainly adds to the per gallon cost.
Mid grade and premium are $0.18 and $0.35 more than regular here, at the two nearest stations. If the gas station, or the distributor was making a fraction of what the state, county, and local governments were siphoning off the top I'd be annoyed that it hadn't gone back to the $0.10 difference. Capitalism? No, mostly political greed.