Tune adjustment for e85 quality N/A?

768MPH

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Houston, TEXAS
I am tuned for E85 from Valero. Ive tested several in my area and all test E75. I tested the local Kroger E85 and it's true E85, some reports (by others in area) that they test E90.

Now, with myself being tuned with the E75, is a tune adjustment warranted if I start filling up with the Kroger fuel while N/A? I do notice a MPG drop running the Kroger fuel over the Valero; due to running more rich I assume.

On another note, I always noticed while testing that the Valero fuel has a cloudy mixture whereas the Kroger is clear as day. Normal?

Thanks.
 

Aaron@JPCRacing

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You're probobly getting less mpg due to the fact that the fuel probobly has more ethonal content which means it requires more fuel to keep the same lambda.

Going from E85 to E98 there's an 8% fuel increase. The car should be able to correct that, but fuel economy will drop.
 

5PNTSLW

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on a base e85 tune i just got it was 29 degrees commanded and the computer added in another 2 on its own, haven't had a chance to log the final tune
 

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