For sure you are looking at it for the right reasons, but a few comments I have learned as I’ve looked into E85 as well.
I have the same ability to have multiple tunes via my TwEECer so haveing a pump gas, race gas, E85 tune is possible. Gping from race gas to pump gas is no issue as it’s still fuel. That transition with E85 to gas or the other way is critical to a performance car. I’m sure you have figured out the fueling differences required, now how do you transition with a partia ltank of either without a meltdown?? The flex fuel cars use a sensor that tells the ECU the mixture.
The quality of E85 is rather suspect at best right now. Becasue cars don’t like to start on it in cold weather, they play with the ratio of gasoline in cold weather, and by location. I have seen guys get a tune spot on, refuel, and then be lost again because of the ratio changes. At a minimum, this is an issue spring into summer and summer into fall. There isnt a lot of control on the actual ratio of gas to methanol. Again, for the flex fuel vehicles, they sense it and get on with it, for a chip tuned combo, you are going to be messed up. It seems the situation with that is better out west where E85 is turned over more. I know some guys in Colarado that are running it exclusively.
I was all about switching to E85 myself to get away from Torco mixing. I’ve resolved myself to a tune that will run on no lead 100, and another for 93 pump gas and living with that until guys get the sensors sorted out to work with Megasquirt or something else (I know some are working with it). That, and it;'s not taking off around here like it has other places (mid west).
My random thoughts on it…
Bob Myers