I was curious after seeing this so last night I put in 3 gallons of e85 and topped the rest off with 93. After a couple pulls I feel like there is a difference. More throttle response and the car seems to pull a bit better. The temp here is in the mid 90's so maybe its simply offsetting that. I have test pipes and a BPM tune as well.
I saw someone mention their exhaust note changed afterwards and I can say that does seem to be true. The exhaust tone seems to be more mellow.
Overall it doesnt seem like a huge difference but if you can sense a change I guess thats worth something.
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