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Originally Posted by mbferrari
Among other things that I do, and so I often talk to the tanker truck guys delivering fuel. They said in the DC area all the gas is coming from the same pipes, the only difference in companies is the additives, that is it.
That being said, I use Shell or Exxon/Mobil 93 only in all my cars, and in the Ford F-250 I use alternative tanks of 87 and then every now and then a tank of 93 octane.
So far no problems...
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might be the same pipes but some compaines such as shell use pigs
https://en.m.wikipedia.org/wiki/Pigging