You’d have to ask the factory but I think the answer is even they aren’t sure. If you have iOS you can download an app called Pure Gas and it will help you locate ethanol free gas. I quality control check by partially filling a small jar with gas and putting a single drop of food coloring in and shaking it. If it’s ethanol free the food coloring will remain solid and balled up. If it’s got ethanol in it the food coloring will look diluted.