Right, here in Costa Rica none of the gasolines have any ethanol on them. There is no E10 here. The relative humidity of the outside, the weather, can easily be between 85 and 100 percent most of the year round. There can easily be water and moisture build up in the gasoline and in the fuel tank, fuel lines and fuel system. I will like to fight this issue by using 99.9% purity Isopropyl alcohol, on every tank on a recomended dose from the isoHEET product, which is the same. There is no problem like with cold weather like, of freezing fuel lines, but corrosion of the fuel tank and fuel lines, as well as not such rich mixture can happen, because of bad gasoline and bad handling of it.