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Your car can adjust of lets say about 30% of E content with fuel trims. But if you put in 93 on a e85 tune, the higher timing will make you knock. Along with running richer, your car will learn the knock and kill all your timing. To the point of limp mode or boom.
So no, e85 with a e85 tune is safe.
93 with a e85 tune is not!
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