Quote:
Originally Posted by rsa
Here is the truth. Exxon makes 2 grades of gas. Regular and premium octane gasoline. It is then pipelined to substations for delivery or the delivery trucks fill up at the refinery. If the gas is to be delivered to a Kroger/non name brand station, it is delivered with out additives. If it is to go to say a shell station it is Exxon manufactured gas with shell additives. And so on. Also, if it is the mid octane gas, the tanker is filled half with half premium and half with regular octane fuel.
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That's pretty much bang on.
Quote:
Originally Posted by mtnfir
A few months ago when we had the gas shortage and premium became nonexistant and 87 octane went to 4 bucks, I did some research. There is basically one pipeline coming into my neck of the woods. All of the gas around here comes from that pipe. Don't think it matters much where you buy it, as it is the same stuff. But I am not an expert.
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Yup. Even diesel and the different grades of gasoline share the same pipe. When they want to switch the different types of fuel, they just start pumping in the new stuff. The receiving end knows how long it takes to get there and before it is due to arrive, they start pumping the fuel to a "waste" tank. There will inevitably be some mixing of the fuel types in the pipeline, so they pump quite a bit into that tank. Then they sample and test the fuel. If it is what it's supposed to be, it goes into the tank for that particular fuel. The fuel in the "waste" tank gets pumped back to the refinery to be re-refined.