Ok Mac... ya got me beat by a few years, We have been cleaning fuel tanks & recycling fuel for around 20 odd years now, As far as the 10mic filters you are way better than most Ethanol does not seem to be a problem till ya get into very high humidity locations where phase separation happens in around 1 week, Ethanol sucks up water like a dry sponge, <hydroscopic> and the water weight drops the ethanol to the bottom of the tank<instant phase seperation> The only way it wont happen in in a non vented storage tank, The problem is so bad in Eastern NC most marinas wont sell E10 & the ones that do have a very profitable fuel system repair service, You are lucky you dont have to deal with the E fuel problems we have here on the coast