I think Shell has been doing that for a handful of years since they came out with their premium grade called V-Power I'm pretty certain, but could be wrong.
Decades ago, I used to work at an aluminum extrusion factory running one of the 1,800 ton presses that extruded the aluminum out of billets, T4, 5, and 6. I can't remember, but was when I ran either the 6061 or 6064 billets for hollow extrusion for say screen door frames, we injected liguid nitrogen into the dies to take out the oxygen, which helped keep impurities from bubbling up in the metal. It works. Was doing it decades ago. Also, during the summer when t would heat up to like 100 or 110 degrees in the plant, used to walk over to the nitrogen bottles and make snowballs from the frost build up and throw them at guys and vica-versa.
I know of a guy that mixes a couple or few ounces of acetone for every ten gallons of premium gasoline he uses in his vehicles to keep the inside of his engine clean. Swears by it. Say doesn't work as well with mid-grade, pretty much not at all or too unstable with regular grade. Only runs premium for better combustion and chemical reaction to the acetone.
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