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The newest jb FW update pretty much solves the issue of the auto learn error and shouldn't be a problem if you update.
No one factors in gas contains 10% ethanol already. You gotta figure if your doing a "so called" 50/50 or 60/40 93/e85 etc it's probably more e85 then you think and you might be maxing out your fuel limits. Obviously a flash can overcome this, but as far as piggyback is concerned try either less e85 or upgrade to the G5 board- cause yes less is more sometimes. I run 75/25-93/e85 sometimes and the car responds better.
And the G5 board has better boost control and wider a/f reading ability so that's another valid option.
Btw as stated by others of course e85 will vary per station, per season, per ground temp., etc.
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