I guess I'm a glutton for punishment, but here goes. I'm truly not an ethanol proponent, but 10% ethanol will not ruin your fuel system or melt plastic parts. Gosh - we're talking about Jack Daniels here! Anyway, ethanol can withstand about 0.1 to 0.7 mass% water before it separates from the hydrocarbon (gasoline) into a phase of ethanol and water (plus possibly some polar additives) at the bottom of whatever the vessel is. Ethanol is a good solvent, as are most alcohols, and will clean crap out of your tank, carburetor, or whatever it sits in. That could cause filter plugging until your system is clean - then it will stop. Brazil is almost 100% ethanol but it took them years of plugged systems to get there. Now they don't care what the Arabs do, they're free. If you live in a constantly humid area, then you will get water in your tank and you will get phase separation and you will have to drain your tank or sediment bowl periodically (you may have this problem if you drive your Model A on the water as in the video). StaBil is a great product and was designed to prevent gums from forming from peroxides caused by the oxidation of olefins in the gasoline. But because olefins cause other problems, they are not used in gasolines as much as they were, and gasolines are much more stable than they used to be - even in storage. Remember also that "winter" gas is very volatile compared to "summer" gas and will evaporate quicker (for better starting and warmup), but starting an engine on a warm spring day with winter gas can cause poor idle, and rough running - not from the ethanol, but from the light ends in the fuel. Tx: the EPA rule is for a minimum 2.0 or 2.7 weight% oxygen to be in all gasolines sold in CO non-attainment areas (10% ethanol contains about 3.5%). Whether premium or regular, the gasoline has to contain the O2 to be sold legally; I don't know how some distributors get away with it (or if they really do). Dave: You can't separate the ethanol from the gasoline by burning it any more than you can drink straight JD after it's been mixed with water. But I do what you do and have been for a lot of years - with no additives and with no problems. Mot: It sounds like you may have methanol in your tank (only allowed 5% and must have a cosolvent). It's very corrosive and will attack some plastics; at 10% ethanol won't. If you are experiencing phase separation from water in your system, you might try adding nore alcohol (say, gas line antifreeze) because the more alcohol in the fuel the more water it can tolerate before phase separating.
