First of all E-10 gets blammed for everything. It does cause real problems, just not as many as you hear about. Of course if your boat gets the problem...
It will combine with water already in your tank and if there's enough water it will fall out of solution with the gas. This puts a water and ethanol blend in the bottom of your tank that won't burn and it also leaves the gas with a lower octane.
Your water seperator should pull out the water but it won't restore the octane. So you should be able to run but you may have octane issues like pinging. Does Star-tron add octane?
Ethanol also cleans your tank and fuel system. This sounds good but the dirt and varnish from years of normal use will now dissolve. This dissolved crap can clog fuel filters and the filter in your seperator. That's probably why they tell you change the filters. Star-tron is going to try and keep the gas, ethanol and water all together so you can burn it, but that means it has to get through your filter.
I don't know why you can't mix E-10 and normal gas.
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