Say goodbye to your two stroke outboards, chainsaws. Many boaters have experienced problems with the 10% mandated fuel soaking up water in as little as two weeks and their automotive based stern drives need major repairs. The recomendation is that one leave as little fuel as possible in the tanks and to fill only what they will consume in the two week time frame.
I can still get ethanol-free automotive gasoline easily, but if I couldn’t I would put av-gas (actually 100LL) in the two strokes. As it is I am checking for Ethanol before any gas is put in the bikes and outboard, just to be on the safe side. The outboard has diaphragm type pumper carbs with no replacement parts available. So far when the distributor has stated there is no ethanol my testing verified the claim. Also using a double dose of Stabil or Stabil Marine because the fuel does tend to sit for months.