Back to the original point of the letter, I really don't know how harmful the ethanol is OR if it is any worse for your plastic/rubber/aluminum fuel system components than the alternative OXIDIZERs that have been used/tested.
I have been running 10% for several hundred thousand miles in my hoopties and my truck has the original fuel pump/system @100K plus miles (not flex fuel design). My 1989 mustang with mass air has the original fuel rails/fuel lines/regulator/soft return lines and is on it's second fuel pump @ 300K plus miles. In the 89 mustang I have worn out 1 1/2 5.0 engines and I'm working on my third AOD but it has the original injectors and pressure regulator (at 300k miles).
I had a 300K 4.6 mod motor town car, a 200k 4.6mod motor town car and a 180k 4.0 explorer sport track, all with original injectors/regulators/fuel pumps/sending units... Most of those miles were logged on 10% ethanol gasoline... Whatever that is worth...
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