New mods all E85 dependent?
 

I just put in a Borla UEL header, Berk high-flow cat front pipe and OFT tune. I've already been running E85, and the car had a Borla axleback on it when I bought it. I doubt that it added much if any, but the header, front pipe and tune have made a significant difference. I'm quite surprised at the added performance. Now I'm worried, because there's only one place in town where I can get E85. If I lose that, I suspect 93 octane won't produce anything near what I have now. I may flash it back to 93 for one tank to see what I get.

Your header is doing some good work in mid range likely, but E85 does give you the extra push all around. I have flex and go between mostly 93 and mostly E85 constantly, and it doesn't bother me too much. But that's only because I know I can always fill up E85. I too, only have one gas station that opened just a couple years ago near me.