Quote Originally Posted by BlackGS View Post
Congrats on the switch and learning to tune. I've been running e85 for about 2 years now on my daily driven Regal. I would say the MPG hit was a lot bigger in my case. I was getting 24-26mpg on gas, and now I usually get 17-18 on e85 even with a leaner open loop tune. I still won't switch back though. Too much fun knowing that I can always run full boost with safety.
At WOT I use a ton more fuel thats for sure, but I have it tuned for milage under cruise conditions therefore saving MPGs.