The new sensor with constantly monitor what's in the tank and deliver adequate fuel/air mixtures that will allow more spark advance because the higher ethanol content is a great octane booster. 30-40HP gains is what I keep hearing.
Kits are available from most car enthusiast retail outlets.
But you can fill up with 93, or E-85. Whatever available.
This looks like a good thread to pick up some info-
https://www.camaro6.com/forums/showt...light=e85+kits