100LL (blue) IS better refined and WILL keep longer, but don't be fooled by the name. 100LL has way more lead than premium pump gas had even "back in the day". It's called "low lead" in comparison to the no longer available 140/145 (purple) avgas that the military used.
You will likely experience sooner plug fouling and you don not want to be breathing the exhaust fumes! GA airplanes will get an oil change and plug cleaning every 25 hours and those plugs do need it! They will be all crudded up with lead deposits. I know from personal first hand experience working on the things!
It certainly won't hurt the engine and would definately solve any octane issues. Perhaps one could blend some with pump gas to bring the average octane where you want it.
Myself, I think propane is a better solution! Higher octane than Avgas and no lead! Cleaner burning too.
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