How much e85 do I add to the tank to equal e30?

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Nadeem
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Looking for some information on how much e85 to add to the tank to get e30? If I run the bm3 e30 tune, would it be better to have a bit over e30 than under? What would happen if you run the e30 tune and have e40 in the tank? If you use an ethanol sensor, which one do you recommend?

Just a noob looking for some answers, been searching the forums and can't seem to find answers to those questions.
Thanks to all who chime in, appreciate it!
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Illsic_Design

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There's a few apps out that can help you calculate how much E85 to add to your gas to get the preferred mixture.
 
 




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