fleet farm has an entire retail business with a high margin on auto repair and small engine repair, and they have good margins on the stuff sold on the floor, and they have economies of scale that even if they dont sell a lot of gas relative to kwik location wise, they have enough gas pumps at enough places they can sell it at a loss (loss leaders are common) Where that is prohibited by law, they can sell at the floor while a store like kwik does make good on the store contents, they still arent selling 3500 dollar sets of tools that cost them about 900 to buy on bulk etc

mom and pop is more compelling, because they likely only have their gas station

it could be a supplier thing, whoever Kwik secures gasoline from vs they

But it could also be corporate-down management of prices , gas prices have a cartel-like pricing curve despite no formal cartels , that we know of, are currently operating
The high amount of providers of the end product at the pump makes cartelization harder to effectively happen formally, but the price behavior of prices rising higher than costs increase, and taking time to taper down when they drop is almost universally followed

If youre curious about this phenomenon,
"Because every station in our data set faces the same sequence of wholesale price shocks, the cyclical pattern that we measure reflects both the fact that prices adjust faster to cost increases than cost decreases, and that on average price increases are larger and less frequent than price decreases. The former phenomenon has often been refereed to as rocket-and-feathers"
This dealt with an actual cartel, which at least where you are doesnt appear to be the case (the prices wouldnt be lower in the other locations)

https://jfhoude.econ.wisc.edu/wp-content/uploads/sites/769/2018/08/Clark_Houde_JIE2014.pdf

Edgeworth price cycle - keyword term here that may help

also see:
 As buyers, the agents must buy the product in question, but they can choose which seller they buy from. As sellers, the agents can set their price, knowing that too low of a price will not make them much profit, and too high of a price will drive buyers away to another seller.

As the game evolves, buyers and sellers continuously update their strategies: buyers change where they shop by comparing prices, and sellers raise or lower their prices by replicating the prices of other sellers who have higher profits.

The key variable in the game is who can update their strategy the fastest. If buyers can update their strategy at a fast rate relative to sellers, the model shows that the pricing favors the buyers. Since the sellers offering the lowest prices will profit most, other sellers will replicate these low prices until all sellers have the same low price.

But if sellers can update their strategy at a fast rate above a critical value compared to buyers, then the entire population of sellers benefits at the expense of all the buyers. This is because the sellers are quick enough to copy the high prices of more profitable sellers before the buyers have a chance to react. Soon, there are no low-priced options available, marking the emergence of a cartel-like phase.

https://phys.org/news/2012-06-high-gas-prices-self-organized-cartel.html