Gin clear skies up here in Lancashire today, so after all this talk of moisture in fuel and little guys living off it , try this with your wasted (moisture laden) Avgas, mix 50/50 with any diesel fuel for any oil burning vehicle, they really run well from it and cope with the water in suspension, however dont run on pure contam avgas, the old Derv engine then runs too hot on pure and tends to crack heads...! no prizes for how I found out!!
Way Way back I read a very interesting true " " story about the Microbal affects of contaminated Avgas on Navy Aircraft, it was only dicovered that Microbes would live in fuel after several unexplained ditchings, then one hero pilot realised something wasnt quite right and managed to get his A/c( Fairy Gannett) back to the carrier, the rest as they say is History
Also the sluge that is left after the tank is empty is sticky and slimmey, it can only be removed from most tanks by the liberal application of plenty of high pressure steam or nearly steaming water, then ati microbal spray and a good drying, but after steam has been used the latent heat normally dries it all perfectly, cant you tell who operates the dishwasher in my wifes house!!
Peter RB