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Personally, I did 30% E85 70% ACN 91.
You will see boost usually around 14-15 PSI after using this, and it definitely has a wow factor. At least it did for me since Im AWD. Definitely log after each fill up. Make sure when you go to the gas station that you have like 20 miles left until empty, this way is easiest so you dont have to calculate what you have in the tank, with what you need to fill up with. If your HPFP is on its way out (I notice you have an '07, so do I and mine is on its way out but wont throw codes at stock levels yet), then going E85 blend will most likely keep throwing limp mode (FML).
I like to fill up with straight 91 and Techron every 4-5 fill ups when using E85 to flush the system. Completely unnecessary some say, but I do it anyways because it makes me feel good haha.
Dont know if I forgot anything... Go to my profile and look up my threads and you will see a few E85 question threads
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