ah yea most are in general automotive, some people blather on about the hygroscopic (water absorbing) properties of ethanol inducing corrosion and premature wear in the fuel system, but basically:
don't get ethanol fuel from a cruddy old looking servo, as there's more likely to be more water and crap in the tanks to start with
don't get fuel when the tanker's there unloading due to all the sediment in the tanks being stirred up
As i've said in the other threads, not only does BP ultimate have 5% ethanol in it anyway, but the gf's datto 1200 has had no lines wear away or mechanical problems in using united e10 for the past 2 years plus. I don't run it in mine because it uses a noticable amount more of it.