Originally Posted by Andy@Livernois
To be honest, we will not touch E85 for tuning. While it can be a great fuel, it is far to inconsistent to trust in this situation. This is the same reason why, when you look at a factory tune, they don't add all kinds of timing into the vehicle. E85 degrades rapidly, and cannot be reliably treated as any better than 89 octane.
Good to know, thanks for the info