George B
¯\_(ツ)_/¯
Mine adjusts almost instantly.BBP tune for 91 octane works great on E85. I run premium only as I cannot find a reliable source for e85 near me. But the hunt is on…. You’d think in Dallas i could find something within 20 miles but it’s proven to be elusive. I tried some but after 3 tanks I was running 28% alcohol content. I hear it takes 5-6 tanks to get an accurate adjustment but I just couldn’t stomach whatever my octane rating was with 87/e85 mix so I’ll find a better source before I commit. I will say it was “sporty” with what little ethanol I could get…
BBP told me that I should run on 89 for tuning. I am going to do my log soon. I will be interested to see how it runs on E85 ( y me its 60%).