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Old 12-02-2019, 07:10 PM   #3
Scooby Newbie
Member#: 458914
Join Date: Nov 2016
Chapter/Region: SCIC
Location: SoCal
2017 WRX Premium


I'm on an OTS tune and occasionally throw 2gal of e85 in my tank when i'm near a station that offers it. Seems to help combat knock, but if you're doing it in hopes of gaining noticeable hp on your butt dyno, then you'll probably be disappointed - I can't really tell the difference between pure 91 and the 91/e85 mix.

Phatbotti says:
"The simple answer is to just try it. If you put the ethanol in and the car knocks worse...stop doing it. If the knock decreases and the car feels better, then you're likely fine."

So to answer your question, yes, you can, but to actually reap any power benefits, you should get tuned for it like noobultimatum stated.
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