would like to shed more light on this guy Xcorbel he has been paving the road for a global E-85 tune and id highly recommend you check out is github page so you can see what he has been up to.
LINK: https://github.com/xcorbel/RX8-E85-Vtune
drop a comment and show some support because if we show a lot of interest in a global E-85 tune hopefully versa tuner can set a preconfigured E-85 tune for new users to flash.
RX-8s run really good on ethanol and make really good NA power on it as well. One common misconception is that you need a power adder to even consider running ethanol which is not true at all. Anyone who says that your wasting time on an ethanol tune simply has never ran an RX-8 on ethanol to begin with. not to mention we can get rid of that pesky carbon buildup by simply running on ethanol and make more power so hell lets run a 50 shot of NOS with Ethanol and gap some 8s that still run on 91.