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I understand that as various refiners push their product down the actual pipeline, it flows like cars on a frieght train, with no air gap. So the beginning and end of a large slug, where they might be a cross between two companies products, is sold on the open market at the gas terminal via the spot market. The independent stations are the primary customers of the spot market. So they may end up with buying a cross mix of two major refiners version of regular. That unknown is one reason why I stay away from the independant stations.
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