Going from race fuel (gasoline types) to Ethanol based fuel (E85) is pretty straight forward. Nitrous sure likes it and overall, from a tuning aspect, you don't have to relearn a bunch of settings. As long as the ambient temps are above 50F, it starts the same and doesn't require additional oil changes. Add 27% to the fuel map from a non-oxgenated fuel map (eg C16) to start with and keep the timing the same. You can keep it in the tank for awhile without worries of corrosion. I would however recommend for racing, using Ethanol from a race fuel company for consistency. I use Ignite Race Fuel which is actually 90% Ethanol; pump E85 summer blend is actually ~80% Ethanol.