I hauled truck load quantities of gas for many moons, but only in the northeast US region. Over the years I saw some of the majors (like Exxon New Haven) mothball their own loading racks & terminals in favor of throughput arrangements to other oil terminals. I do believe they save a great deal of money this way. The result is now many (but not all) brands of gas all coming from the
same pipes, with an additive by brand of gas package injected into the loading pipes at the time of loading the gas into the truck for delivery to the gas station. The questions in my mind were: how good is the current fuel base stock in the terminal's storage tanks, and what are the additives? Neither piece of info gets too far past the people in house at the terminal.
Not all the gas suppliers do throughput. There is a website devoted to a handful of refiners who apparently go a notch or two further than the others in their desire to provide a quality additive package. Not coincidentally, the names I read also maintain their own loading racks / terminals. The link is in one of the old posts, but I don't recall where. I do recall that Shell is one of the members of the higher quality gas club, and I think Amoco? There are others as well.
Will one brand of gas vs. another make much of a difference in a 50-75 HP Triumph? I say in general, no, but others may swear the answer is yes. I would suppose the more exotic the engine, like a Ferrari or new Corvette or the like, the difference in gas would be more relevant than say, a '64 Belvedere.
