Wanna see phase seperation, come down to coastal Georgia.
Humidity and temp. change
The real damage is to rubber/ plastic parts. EPA fuel hose seperates between the layers.
EPA said we had to use the new hose because fuel was migrating out thru the hose.
Temp. does things to the ethanol.
It will keep all sorts of stuff in solution/ dissolved. The motor will work fine for a while.
What happens to the fuel after the filters on into the carb, pumps, etc gets costly.
You run the motor, it gets hot. Then shut it down. Now the hot fuel in the bowls, injectors etc. heated by the motor cools down.
When it cools stuff drops out of solution and collects in the bowl.
It looks like a tan oil/goo.
Now you pour out the fuel in the bowl and set it down for a minute.
The remaining fuel evaporates and this tan sand forms and becomes hard as a rock.
When the motor sucks up the goo and shoves it to one of the injectors you run lean burn things etc.
The crud forming and the rubber, metal, plastic eating from ethanol is worse than phase seperation.
The feds rules state that the fuel supplier cannot mix the ethanol into the gas until the gas is being loaded into i fuel tanker to be deilered for use.
If the feds say it eats tanks, lines, and seperates in large storage tanks i don't want it.
Use it fast, daily in a nonvented system it is OK but small engine and weekend use it has major issues.
K2 is the oil to use.