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2018 Base Ecoboost, Stock/Factory Tune, M/T Tires
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Discussion Starter #1
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??
 

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I would imagine you are ok as long as you baby it while on 91 no hard pulls and maybe drive in wet/snow mode until you can get 93. Plus you probably had a little 93 left in the tank pushing it closer to 92 octane. I always do 91 tunes especially for when I travel out west and 91 can be a challenge to find at times.
 
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