I understand fungible markets quite well. The whole point of this article was that producing our oil won't make us energy independent because of our commitment to keeping international oil markets fungible.
We could tariff or ban exports of petroleum products and American produced oil would only be fungible within our borders. But we don't have the will to do that, for that would be disturbing our "Free trade" mantra.
You just proved you don’t understand what fungibility really means. If we produce enough to break even, or be a net exporter on net, then who gives a sh-t whether the specific gallon of gas in your Prius came from Texas or Alaska or the Dakota’s or Saudi?
You know the def of fungible perhaps, but you haven’t a clue how to apply the definition, which your post PROVED