[sammyg2]

Yup, doesn't matter who sells it, the gas could have been refined anywhere. The additives are the only real difference, with one possible exception:
I will not run Arco gas (BP-Amoco now) in a high performance engine.

I can't say why and back it up with facts, it is just that 've had some bad experiences over the years with pinging. May have to do with a higher percentage of reformed or cracked gasoline feedstocks (less stable over time) or maybe I'm full of it. Either way that's what I think. I do know that Arco has some different refining technology (most majors do, others use patented Fluor or API technology).