OK, I know you have no idea !!! Agreed.
Where do these gas stations get their gas from, BP Stations from BP, Shell from Shell, etc... Most of these have franchise contracts, these contracts, control pricing. Sorry just the way it is.
Now, lets assume you want to go it alone and be none franchisee, and buy gas. Where do you get it from? Well you don't have to many options, BP, Shell, Chevron, Citgo, ExxonMobile, etc... You will not get the Franchise rate, you will pay a premium. But then you can set the Profit Margin yourself, but to what end. Your price by design will be higher than everyone else.
Here is an excerpt about Divorcement Law:
Independent retailers often have difficulty surviving in industries marked by a high degree of vertical integration. In the petroleum industry, for example, many gas stations are owned and operated by oil refineries. These companies are able to control the wholesale price of gasoline sold to locally owned franchise stations. They also set the going rate at the pump through company-operated stations. By narrowing the difference between the wholesale and retail prices, oil refiners can squeeze independent and franchise gas stations out of the market.
But don't believe me, go ask a locally owned operator. He will tell you.
However, if you happen to have a oil well in your back yard, own a refinery, and a gas station. Your set, charge what you want.
Having a franchise contract doesn't mean you can't set your own prices. Obviously they won't sell gas to franchises super cheap. But that doesn't mean that they can't charge more because of whatever reason they want. It's just competition keeps them from setting them too high.
Do you have any evidence of this? Or is it your own made up conspiracy theory? Because I have seen gas prices skyrocket overnight due to the oil futures market going up huge. I've seen it drop huge overnight as well.
You are telling me that every independent gas station owner and franchisee, who already has huge tanks, couldn't just stop selling gas for a week to make this extra profit? They already have 10-20,000 gallon tanks. If the price goes up by 10 cents, they could make an extra $1-2000 by just holding the gas. So why don't they do this? You are the only genius, and people who already have the infrastructure in place are all idiots?
It's funny, most people have the opposite complaint you do. "Gas went up 20 cents last night, but they still have the same gas in the tank they paid for last night! That's gouging! They bought it cheap, the should sell it cheap!" This is the exact thing you are claiming they cannot do.
The reason they do this, of course, is because 1) they can, and 2) sometimes the price goes down, and they need to sell current inventory. They are much more likely to sell gas at the price they expect to refill their tanks at than whatever they paid for the last tank.
Go to any gold coin dealer, same thing. If you sell them a coin for $1400, and then gold drops to $1350 next week, your coin is not going to still be for sale for $1425. It will be for sale at $1375 (or whatever premium exists). Same thing if you sell it to them when its $1400/oz, and it goes up to $1500/oz. That coin won't be sold for $1500 anymore. By your logic, you could buy lots of gold coins when the price rises, since by the time the gold dealer restocks his inventory, the price will go up! But he changes his prices often according to the futures market.