Don't worry, by 2035 we won't be allowed to own ANYTHING gasoline/internal combustion powered anyway.
The higher octance is a waste of money and only needed if required by the manufacturer. The ONLY reason I ran 91 octane in the small engines/outboards was for the "zero" ethanol. I do not own any high compression ratio engines that would require the higher octane. So I guess now I can save some $ by putting 87 octane in everything.
I will add to the discussion by suggesting "Star-Tron" as a fuel additive.
Oh and if you have further interest, "Project Farm" youtube does some great experiments! Warning, you will start watching this guys videos and then wonder where the last couple hours went.