Quote Originally Posted by 97AutoXVette View Post
Note that E85 is pretty forgiving though. As in even this coming winter, when it is more like E70, than E85, I will not change my tune. I will just let it run on the rich side for several months (unless I have some issues, which I would report to this thread if so!)
Changing tune for the winter is not necesary. Going from E85 to E70 requires about 6-7% less fuel, our PCM's can easily compensate for more than 15% in either direction. That is why you can run E30-50ish Without a tune on stock injectors if you wish.