I had some experience in driving a fuel delivery vehicle for a year here in NC. I was talking to the tanker driver when he was off loading a tanker of gasoline and he told me that when he picked up in Norfolk Va. that all the different companies loaded from the same tanks and that additives were put in to make the brands unique. The basic gas came out of the same tanks for Shell, BP, Wal-mart, etc. and he thought they were pretty much the same regardless of brand.

Tennor