To eliminate carbon buildup on valves. Use Seafoam cleaner before each oil change and fuel up. I have used this product and it's amazing!
Ethanol is nothing like regular gasoline. It doesn't burn the same. It leaves carbon deposits on vital components of your engine. I have used Seafoam solvent each oil change and fuel up and my vehicle runs amazing!
Just a hint Ethanol leaves far less carbon than lead additives.