17 Ecoboost

Discussion in '5 Star Tuning' started by coolzzy, Apr 29, 2018.

  1. Savannah Dan

    Savannah Dan Member

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    Apr 1, 2018
    Savannah, GA
    What I found out about 87, 89, and 91 octane fuel with the factory tune:
    I can't find my notes, so I don't have the exact figures. I got about 1 more MPG with 89 than I did with 87. I got about 1 more MPG with 91 than I did with 89. After doing the math, I found out that the cost to run 91 was about the same as running 87 or 89. I was very surprised.
    I tried the same with non ethanol gas, hoping to get even MPG, but the results were about the same.

    Edited to add post from June 2018:
    Last edited: May 11, 2019

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