its usually not something to really worry about, its just like running into a bad batch of gas, but it does happen. the mixing is more important, if you switch between the fuels make sure you do it the way it was when the car was tuned, if you have too much gas in your tank you will lower the octane of the e85 when you fill up, and if you have too much e85 in the tank you will lean out if you fill up on gas. this is why the alcohol percentage sensor is so important, most tunes are safe enough to handle the minor variations but you won't want to fill up when you have a quarter tank of the other fuel left in the car. and a minor variation could still cause you issues if you are a little off and you run in to other problems.
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