Originally Posted by rader1
Unfortunately, the 10% ethanol 91 octane will probably be worse. e85 is about 107 octane where 91 with 10% ethanol is still just 91 octane.
I recommend flashing over to the Drive map and see how the logs look. Give it time to adapt after flashing before logging, ofcoarse.
Just did a datalog on STG 1 drive v401 CA91. Looking better, was wondering if maybe you experts can take a look. Thanks!