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The oil is transported through oleo-ducts from ports to refineries where they get refined: through distillation ethane, ethylene, propane, propylene. kerozene... etc all get separated feeding steamcrackers for plastic production amongst other things... It is possible that some joint ventures exist (I know of one in Port Arthur Tx where Total (yes French Oil company) has a JV with Exxon. All the gas does not come from a common refinery or a single tank. This is a big misunderstanding. Companies can share investment to share a supply. Gasoline is also not transported through pipes over long distance. Only oil (and natural gas) is. The additives are proprietary to each company and are not usually shared. Gasoline is transported by truck for the most part... We would not need to have all these refineries strategically located all over the country...
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