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Use whatever is the lowest octane gas you can get without ethanol.
No need for anything more than 87 for the Ninja, unless you have to go higher to get away from ethanol. Excessive octane reduces power.
Gas without ethanol will make a carbed engine run richer than gas with ethanol - which usually means better.
I don't run gas with ethanol in anything with a steel tank, or any small 2-stroke.
Gas with ethanol goes bad quicker than gas without.
If tuned precisely for it, gas with ethanol can produce slightly more power, but it's not significant in most applications and doesn't offset the disadvantages, IMO.
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