Forgive me if this has been covered already, I searched E-85 threads and didn't see any answers. I noticed some SHO members are running 20% E-85 blend. Does this require a Custom tune, or can/do you use a meth tune? Correct me if I'm wrong from what I have read it seems Meth and E-85 produce same results which is the ability to advance timing due to increased octane. I am thinking of trying a 20% E-85, I have no mods other than 5 Star Tuning (93 Performance tune). Im assuming I won't see any gains unless Im running a custom tune to advance the timing to take advantage for high octane?
Sorry for newbie questions this is my first forced induction vehicle.