I drive mine daily and run E50 blend which is E85 and 91 or 93 at pump. See chart below. You need to measure the E85 pump you using as it could be lower or higher then E85 my local pump happens to be exact 85% when I measure it. most gas is 10% ethanol at pump so Fuel 1 is 91 or 93 octane using 10% and Fuel 2 is E85. with @wgr73 cobb tune makes 500 rwhp and if you upgrade to HPFP he has already had one making 525 rwhp
I will be upgrading to a HPFP to run straight E85 not for the extra 25hp but for cheaper fill ups vs 91 16 gallons and yeah i take another 25 hp
hope this helps
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I forgot to call you yesterday. My fault! We'll talk today, yesterday was busy.