[vasillalov]

Originally Posted by enrita

you need to achieve 98 octane:
http://www.intercepteft.com/calc.html
so you probably need to increase scalar value to run higher % of E85 in order to not max out fuel trims

Enrita,

I think you need to stop quoting this online calculator! There is ONE MAJOR error in it: it assumes that the octane rating of E85 is 105. This is the RON rating and it can be very misleading since the gasolene in the USA is rated using AKI (Anti Knock Index).

So, just to be clear here: E85 has AKI index of 94-96. Premuim gasolene has AKI rating of 91-93 depending on the state you get it. That number is written on the pump!

DO NOT confuse RON ratings with AKI ratings when you are blending fuels!


EDIT:
To get 14 gallons of E30, one needs to blend 4 gallons of E85 and 10 gallons of AKI 93 fuel. This will end up achieving 14 gallons of E31 and the AKI rating would be 93.3 which is just 0.3 bump in AKI from what you normally get out of the pump