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Remember that 100LL avgas DOES have extremely toxic organic lead compounds (TEL) in it. I see no reason to expose oneself to this in outboard motor service. And Coleman fuel is even more expensive than AVGAS and probably gives you no benefit at all. (But I have no idea what the "octane" of Coleman fuel might be.) There is no advantage to using fuel with a higher octane number than needed to prevent detonation.
Around here (Minnesota) many gas stations sell no-ethanol "recreational" gas, but they are also starting to sell gas that is 15% ethanol, as opposed to the usual 10%. This is pure welfare for the corn growers and distillers. Whether it will cause a new set of problems remains to be seen.
I’ll say no more about oil mix ratios except that Clinton tended to specify a lot of oil.