Quote Originally Posted by F6Dave View Post
Have any manufactures standardized the additive packages across all grades?
I have a few friends who are retired chemist or are still working in the petroleum industry, I have asked that same question of them and I have always got a positive NO! The higher Octane fuels get more additive. Other than Chevron which runs close to the same additive package in all their fuels grades I don't know of any, but that not to say some manufactures I'm not familiar with do.
Here is some trivia for ya.
"Chemical additives first entered the industry in the first decade of the century. These additives served a number of uses. For example, they lessened the capacity of gasoline to vaporize out of the gas tank or to polymerize (i.e., produce gummy residues) in the engine. In the early 1920s, the most important application for these substances was to eliminate knocking. Tetraethylead (TEL) was the first major gasoline additive to be commercialized for this purpose."

A nice read on Gasoline and Additives.
https://www.encyclopedia.com/environ...-and-additives