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Having dedicated tunes is a risky thing IMO. When you switch fuels, there is no guarantee that you have completely emptied the old fuel out, so you may still end up with a blend. Also, ethanol content varies at pumps, so you may get E70 from one place, and E85 from somewhere else.
I can get you set up with everything you need to do true flex fuel. The advantage to doing that is you won't have to think about it when you do change fuels. You are correct in that the tune is very important (and required).
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