“I can dial up what I need using E85Cal App on my phone”
Your phone app measures the E85 octane?
It requests the alcohol content of the E85 which is posted on the pump and provides all the needed measurements and final output including ethanol percentage already in the tank. I have to excercise while it stopped raining it’s not like I’m the only one that does this sure works out better with no ethanol super unleaded because then you get to add more of the E85 with the higher octane
Use final octane calculators from mixes like here : https://www.morepowertuning.com/emix
E40 mix with my fuels would be over 99 octane