There are lot's of myths floating around. Much easier to perpetrate these stories on the public in internet chat rooms.
We have had E 10 in this area for 25+ years. ALL my small engines have run and run well on it. I have seen no deterioration of rubber parts other than what was normal with straight gasoline. Still have old tractors that have the original fuel hoses, needles/seats, etc. on them. The only carbs I have seen gummed up was BEFORE I found out that the ethanol really likes to attract water. The sealed cans fixed that problem. Carbs that run on straight gasoline will gum up also. They'll also dry out and get full of a white powder caused by corrosion and this is nothing new. Been going on since there's been carburetors.
Ethanol does a very good job of keeping your fuel system clean, ONCE IT IS CLEAN. If it's dirty, it's first doses of ethanol can/will scrub the dirt off and may cause problems.
Octane boosters bought off the shelf in parts house will raise octane a very insignificant amount. But so will kerosene. Check contents of the bottle and see what you're actually getting.
Higher octane fuel puts out no more power than regular if your engine is tuned to run on regular. 93 is also no more volatile than 87 so there is no advantage in starting the engine.
If your engine is taking 3 minutes of cranking to start, you have a mechanical/electrical problem and that's what you should concentrate on rather than some miracle in a can or bottle.
Of course, you could just have a tank of contaminated or really old fuel.
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