Originally Posted by nema
On ACN fuels with the drive map you can probably expect a ~30whp/50wtq bump in power. If you start mixing in e85 you can start more agressive mapping. With e85 on sport you can expect ~10whp on top of that and aggressive is another ~10.
You can try running Sport with the ACN 91 but i haven't seen many(if any) datalogs that looked really good on anything than the Drive map.
VNeBLOB has a ton of experience with this exact situation and i'm sure he'll chime in and give you his finding.
thanks nema im guess ill pm him!