My philosophy is LESS IS MORE.
Had dried out gasket problems on an E1500 so draining was not the answer. Nor was the marine corrosion of potmetal inside the dry carburetor.
Adding garbage atop garbage seems silly. So I drain out all the USA gasoline when I am forced to use it. Every last drop. Then I pour in a half quart of white gas into the tank, start the unit let it run with no load for 30 seconds and shut it off. White gas cannot gum up. Not a tiny bit in a hundred years.
It is not a power fuel it is a storage fluid. Drain out the tiny bit of white gas remaining, install faux-gasoline and start on the 2nd pull. Been doing it for 30 years so have all the north coast loggers in their chainsaws.