So, what is your point? Some cars require 91 or better octane to avoid knocking, which is never a problem in America. There is nothing at any gas station or pump that delivers “cylinder lubricant.” If you buy it, you’re on a nigger level. Next you’ll buy the car wash with “Teflon” to protect your paint @ 19.99 a shot.
Yes of course, gasoline is a solvent, and it sprays on top of the cylinders, therefore only carbon can accumulate. This is particularly bad on direct injection cars, which is why they started using both port and direct injection. Lubricating the combustion chamber with a solvent that dissolves carbon and sticks can helps because that is the one part of the engine that has the least lubrication. Gasoline is a solvent after all.
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