That's now how it works. That's not how any of this works. Do they not teach science in school anymore?
There's no "recipe" to fuel. It's not "made" at all. (And no, not even race fuels). It's a process called distillation. Basically, you heat up crude oil in a large vertical column, and up top rises the lighter fuels with lower molecular weight, and down low the denser fuels. You suck of the stuff you want at different levels. They kinda have it down to a science. You know, 100 years of doing it, and a few trillion dollars in sales later. They know what they are doing. But if you think you know more....by all means, enlighten us.
The "additives" - that you mistake for sloppy manufacturing- is actually additives put into the petrol by the petrol company AFTER distilling. It's there to do things like increase octane, remove carbon deposits, and IIRC reduce it's hygroscopic...ness. And that is why I always try to buy Chevron gas. In my neck of the woods it's 5 cents more. So filling up a e30 tank is an extra $0.70. And IMHO it's totally worth it to keep carbon deposits at bay.
So.....Ya' really don't know what you're talking about. Sorry - I don't want to come off as an ass....but I hate mis-information with half formed ideas backing it up. So don't shoot me.

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