Hello
I know this is an old topic but I'm new in this area. I have a 2020 Mustang GT auto transmission and I wanted to enable the flex fuel logic from the tune. I enabled it from the tune and I copied all of the flex fuel tables from flex fuel truck. The issue now is after filling the tank with E85 the car was too lean and the short fuel trims are about 35-40% lean. I thought maybe it was bad E85 and I switched to X85 just to make sure I have clean gas. I've been searching and reading if I should tune the car after using E85 or the flex fuel logic should correct everything for me. Should I dial the MAF after enabling the flex fuel?
Thank you everyone.