I’m going to give you a quick run down of gas. Gas actually is made in two versions you have high and low grade then they mix high and low to get medium. While the gas is pouring into the tanker ethanol is mixed in. This prevents gas from freezing (bottled is the product called heat). The ethanol causes the debris in gas to keep from sticking to lines and metal. So if u use ethanol free for summer than ethanol in winter it’s cleaning everything left from summer and could cause gas filter clogs. The best website I found for gas information is gasbuddy.com you can set the specs to find high grade. If u are looking for 100% which is ethanol free look at Murphy USA which is Walmart gas station they usually have all versions and you can set up a reward system to get .10 per 100 points off per gal up to 20gals.