E10 actually attracts water.
Ethanol can causes problems
Because ethanol has an affinity for water, you need to be aware of the conditions in which you operate your equipment. Powersports and lawn & garden equipment should not be stored in damp or wet environments. When water is allowed to collect in the gas tank, the bond between ethanol and gasoline can break, causing a phenomenon known as phase separation.
The ethanol bonds with the water and sinks to the bottom of the fuel tank, which can create a whole host of problems, including the formation of gums, varnish and other insoluble debris that can plug fuel passages and negatively affect engine performance. When this ethanol/water mixture is pulled into the engine, it creates a lean-burn situation that increases combustion-chamber temperatures and can lead to engine damage. Once this happens there is no easy or inexpensive fix. To avoid these problems, contaminated fuel tanks should be emptied and refilled with fresh fuel.
That only occurs if you are storing the moto longer than a month. If you ride regularly e10 does a much better job of keeping your tank clean and dry because you are actually burning off any water. E0 won't do that.
Moisture in the air enters through the fuel tank gas cap and vent. It actually starts when the fuel is stored at the gas stations.
Ethanol naturally attracts water vapor in the air
Water can condense on any cool surfaces of the tank above the fuel
Rain water can seep around a worn gas cap
Ethanol free gas oxidizes and starts to create gum and varnish in roughly 60 days
E10 can start to deteriorate in roughly 30 days
Ethanol is a solvent that dissolves gum, varnish, rust, dirt deposits and non-metals
Ethanol resistant non-metals break down more slowly
Ethanol-water settles at the bottom of the tank
Bacteria feeding on the ethanol excrete acetic acid that corrodes metals
Water mixing with standard gas additives create gum deposits
Gum, varnish, and deposits clog the fuel system over time
Ethanol-water at the bottom of the tank gets sucked into the engine, causing starting issues
Fuel stabilizer grabs oxygen in the gas, slowing it from turning into gum and varnish
Fuel stabilizer slows the bacteria growth
Keeping your tank full will prevent tank condensation
E10 used frequently can keep your tank dryer and cleaner
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