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if you live near e85 stations, and have the budget to do a flex fuel system (like the Delicious Tuning one), then 100% go for it. the only way I would do an e85 tune is with a flex fuel module so that I am not forced to use e85 only. unfortunately where I live, e85 is nonexistent unless you live in a metropolis like LA.
I guess a con of e85 is less gas mileage, but e85 is also cheaper than 91 so in the end I think it cancels each other out. of course, the main pro is that you get all that extra power and knock protection lol
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