I think there's something wrong with the FF tune I got. My car has never acted up like it did on that tune, and quite frankly, I'm concerned going back to it. If it acted the way it did with just a little 93 in the tank, what's the use in using it at all? Just my thoughts about that, but yes, I will be getting a tester very soon. The only downside, is that in my area E85 is only sold by a couple of stations, so after the dedicated E85 is dialed in by PBD, I'll probably go back to the 93 tune anyway. If the FF tune, didn't act like it did, I would've stayed on it.I recommend testing your fuel with a test kit if you’re running the dedicated E85 tune, otherwise, I’m not sure it’s safe to be going WOT on the dedicated tune with more aggressive timing If your ethanol content is too low. Maybe run that tank out on the dedicated tune without going WOT and then switch back to the flex tune. My car lives on the flex tune because it’s Always hit or miss finding E85 with 80% or higher ethanol at the pump.