I use E-free "premium" which is 91 octane at Murphy Oil (Walmart) in tools and motorcycles. My backup is E-free 87 "regular" from another station. The backup station pump is old style, dedicated to E-free but the Murphy Oil pumps are the newer kind where all grades of gas come through a single hose. That's always bothered me since most people are filling up with 87 E-10, how much of that is still in the pump and hose when I select premium? If I'm only filling up a gallon jug, it's a concern. I'll try to flush the hose in my car with E-free before filling gas cans. Non-ethanol is better in every case IMO. I get 2-3 MPG better in motorcycles with E-free. Even though I let carbs run empty every time AND I dump any leftover gas, there's still a residual.