2018 Base Ecoboost, Stock/Factory Tune, M/T Tires
While in Michigan, I ended up with a tank of 91 octane fuel. I normally run 93 octane with a Cobb stage 3 / 93 octane map. I'm thinking of adding a shot of E85 and topping it off with 93 octane. Just wondering what effect this could have on the performance and/or any confusion to the ECU, etc??