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      01-20-2020, 09:40 AM   #11
Second Lieutenant
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Drives: '19 Audi RS5 Sportback
Join Date: May 2019
Location: Erie, CO

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Originally Posted by HyeM3 View Post
Yeah OP prob won't experience any gains but adding a few gallons still should help boost the octane in his tank slightly and help prevent knocking. If it's readily accessible where OP lives I'd say it's worth a shot just for that!
Fair point.

In my Subaru days, (3 consecutive model year STI's before an S4, then this M3) E85 was an absolute godsend as the stock tune, and even aftermarket tunes, had a tendency to knock at scary levels. Switching to E85 flex fuel tunes completely solved the issue.

With that said, being new to this platform, I'm curious, is it common for the stock tune on these cars to run lean and generate frequent knocking events? I hadn't read that in my initial research or in the 9 months since I bought it.
'19 Audi RS5 Sportback

F80 ///M3 | Mineral Gray Metallic | 6MT