The same advice from the shop where I bought a small outboard motor.
The same advice from the shop where I bought a small gasoline generator.
No way to prove it, but I feel like my fuel related repair bills have gone down, way down using 100% gasoline.
Premium gasoline (91 octane) with out any ethanol was running about 25 cents per gallon higher than Regular gasoline (87 octane) with 10% ethanol.
About a year ago the price differential jumped to 40 cents per gallon higher. I think sales were booming so stations tried the higher price for the summer months. Six months later (last fall) the difference fell back to 25 cents and has stayed there.
When I pull up to a dispenser at a gas station I pump 3 gallons of premium in my pick up tank before filling my 2 and 5 gallon gas cans. I have to assume that the hose and piping inside the dispenser were full of gasoline with 10% ethanol in it. Then I fill my gas cans.
After about a year of doing that I decided to use Premium in my pick to see how it did. The miles per gallon for the pick up went up 11%. Right now the cost difference is 7%. A savings of 4% isn't much, but it has to be better for the motor in the pick up as well.
Some people test to make sure the gas they are buying contains no ethanol. A retired man here on FR said his test kit cost just under $30. He said it was slow, but he was retired and had the time to make sure.
A year or two ago someone here on FR told this story:
A friend of his owned a Chrysler dealership. Some of the new cars he had sold kept having problems with the way they ran. His service department could not find the reason for the problem. Finally the dealer bought an expensive ethanol test kit and found that gasoline that was supposed to have 10% ethanol had up to 21% ethanol in it. The service department drained the gas tanks and filled the tanks with E-10, problem solved.
Not all Premium gasoline is free of ethanol. Most clerks in C Stores have no clue about what they are selling. I just go by the sign on the pumps. Yet at $85 an hour for repairs to an outboard a test kit might not be a bad idea.
Pure-Gas.org/ lists locations that sell ethanol free gas. You might find something in your area. The list is by no means complete, but it a place to start.
BTW I still add Seafoam or Stabil to gas that might be stored for awhile either in cans or gas tanks.
You cant get 100% gasoline.
That’s the trouble.