Market Price: Yes, this is of course a factor. Generally, gas prices at the pump rise very quickly when the market price of crude or gasoline goes up, then fall more slowly than the market price, because the margins on gas sales for a C-store are very slim. When prices change, the C-stores lose either way; when prices rise they have to pay more than they got from the last tankful to buy the next one, and when prices fall they don't recoup the cost of their current tank.

Taxation: Most states charge a tax on gasoline, in addition to a Federal tax on gas. That revenue either goes into the State's general fund, or is earmarked for transportation costs like road maintenance. California's gas prices are sky-high across the state, because they have the highest gas tax. I'm not sure Colorado, Wyoming and Montana have gas taxes at all.

Proximity to other stations: No matter what you have to pay for the land and facilities, if there's another station across the street, you have to be within a penny of their price or people will vote with their feet. While "predatory pricing" (taking a loss on sales in one area, buffered by profits elsewhere, in order to drive out competition) is technically illegal, you see it all, the, time in the C-store industry. This is a primary cause of neighborhood-to-neighborhood changes; a C-store will look around the other stations on their street corner, and the ones down the road a block or two each direction, when determining what they can sell gas for that day. The guy five blocks down has a completely different pool of competing stations.

Market Price: Yes, this is of course a factor. Generally, gas prices at the pump rise very quickly when the market price of crude or gasoline goes up, then fall more slowly than the market price, because the margins on gas sales for a C-store are very slim. When prices change, the C-stores lose either way; when prices rise they have to pay more than they got from the last tankful to buy the next one, and when prices fall they don't recoup the cost of their current tank. By quickly increasing the price to match commodities market prices, then gradually lowering them over time even if the market collapses, they mitigate the losses both ways.

Taxation: Most States charge a tax on gasoline, in addition to a Federal tax on gas. That revenue either goes into the State's general fund, or is earmarked for transportation costs like road maintenance. California's gas prices are sky-high across the state, because they have the highest gas tax. I'm not sure Colorado, Wyoming and Montana have gas taxes at all.

Proximity to other stations: No matter what you have to pay for the land and facilities, if there's another station across the street, you have to be within a penny of their price or people will vote with their feet. While "predatory pricing" (taking a loss on sales in one area, buffered by profits elsewhere, in order to drive out competition) is technically illegal, you see it all the time in the C-store industry and it is very difficult to prove. This is a primary cause of neighborhood-to-neighborhood changes; a C-store will look around the other stations on their street corner, and the ones down the road a block or two each direction, when determining what they can sell gas for that day. The guy five blocks down has a completely different pool of competing stations.

Brand: There are generally two levels of pricing: "major brand" and "discount brand". You can generally expect the "discount brand" to cost about 5-10 cents less per gallon in the same neighborhood as "major brand" gas. This is for a number of sub-factors; chief among them is that not all gasolines are created equal. A lot of the major brands (Shell, Texaco, Chevron, BP, Exxon) have proprietary detergents and cleaning agents that the discount brands do not. They're also generally closer to the real octane rating of the gas, and have stricter requirements about storage tank maintenance. Anyone who tells you that all gas is the same, send em my way; I tried to save a few bux buying the cheaper stuff and now my car needs an engine overhaul because of fouling causing premature wear. A couple of my co-workers got a fuel system overhaul free from the local supermarket because the storage tank wasn't properly purged, and they got water into their gas tanks.

Market Price: Yes, this is of course a factor. Generally, gas prices at the pump rise very quickly when the market price of crude or gasoline goes up, then fall more slowly than the market price, because the margins on gas sales for a C-store are very slim. Some stores even use it as a loss leader, taking a loss on the sale of gasoline in order to get you into their store to buy snacks, drinks and smokes at a hefty markup.

Population Distribution: With a lot of people in a particular area, there's a big "pie" of customer dollars for C-stores to compete for. This generally leads to increased prices because the stations don't have to be AS cutthroat; regardless of how good your price is, you have only so many pumps, and at some point people will pay more to use the open pump than wait for the cheaper one. The reverse is true in rural areas; with only two stations in an entire small town, those two stations will become extremely cutthroat. However, rural prices also vary more; with only one station in easy walking distance from where you ran out of gas, they can charge you $6 to fill that gallon gas can if they want, and you'll pay it because the next gas station's another 20 miles down the road and probably has even higher prices. This, along with overhead, is generally why the Rockies states have the lowest average prices; land's cheap and people are scarce in Wyoming. But, the "price-gouging" can be seen in the rural Southwest, where there's a LOT of ground to cover between gas stations, and so the "last chance gas" along major highways just outside of town is a common stereotype.

Brand: There are generally two levels of pricing: "major brand" and "discount brand". You can generally expect the "discount brand" to cost about 5-10 cents less per gallon in the same neighborhood as "major brand" gas. This is for a number of sub-factors; chief among them is that not all gasolines are created equal. A lot of the major brands (Shell, Texaco, Chevron, BP, Exxon) have proprietary detergents and cleaning agents that the discount brands do not. They're also generally closer to the real octane rating of the gas, have less ethanol (you'll see the sign that says "contains up to 10% ethanol"; the bargain brands are right up at that limit while the top-tier brands keep it lower) and have stricter requirements about storage tank maintenance. Anyone who tells you that all gas is the same, send em my way; I tried to save a few bux buying the cheaper stuff and now my car needs an engine overhaul because of fouling causing premature wear. A couple of my co-workers got a fuel system overhaul free from the local supermarket because the storage tank wasn't properly purged, and they got water into their gas tanks.

Market Price: Yes, this is of course a factor. Generally, gas prices at the pump rise very quickly when the market price of crude or gasoline goes up, then fall more slowly than the market price, because the margins on gas sales for a C-store are very slim. When prices change, the C-stores lose either way; when prices rise they have to pay more than they got from the last tankful to buy the next one, and when prices fall they don't recoup the cost of their current tank.

Population Distribution: With a lot of people in a particular area, there's a big "pie" of customer dollars for C-stores to compete for. This generally leads to increased prices because the stations don't have to be AS cutthroat; regardless of how good your price is, you have only so many pumps, and at some point people will pay more to use the open pump than wait for the cheaper one. The reverse is true in rural areas; with only two stations in an entire small town, those two stations will become extremely cutthroat. However, rural prices also vary more; with only one station in easy walking distance from where you ran out of gas, they can charge you $6 to fill that gallon gas can if they want, and you'll pay it because the next gas station's another 20 miles down the road and probably has even higher prices. This, along with overhead, is generally why the Rockies states have the lowest average prices; land's cheap and people are scarce in Wyoming. But, the "price-gouging" can be seen in the rural Southwest, where there's a LOT of ground to cover between gas stations, and so the "last chance gas" along major highways just outside of town, each a nickel to a dime more than the previous station, is a common stereotype.