[Old182]

FWIW, I agree with Mitch. Ethanol has been around long time and it's not going away any time soon thanks to an out of control EPA (but that's another issue). Because of the oxygen, ethanol "chemically leans" the mixture (reducing CO) so richening the mixture with the GAV makes sense. If your engine runs best a half turn richer than it used to, then do it. While most cars see no effect from 10% ethanol, 2-cycle engines inherently run rich and they seem to have the most problems with "crap gas". I add extra oil to my chain saws, weed whacker and blower to compensate for the leaning effect of the ethanol. I'd rather see blue smoke than replace equipment. We have the ability to richen the mixture on our Model As and should do so if that's what the engine wants. Regarding deposits on jets or other fuel system parts, alcohols are good solvents and would clean deposits not add to them. But fuel additives are very high molecular weight compounds (usually diluted with kerosene) - deposits you see may be the additive, not the ethanol. There's no magic in the real world - it's all chemistry. Besides, ethanol can't be THAT bad - Jack Daniel's is 45% ethanol. P.S. Mass Man: try another airport but have a wing number with you as there is no road tax on avgas and FBOs can't sell without one. Avgas is the best fuel you can get.