i was at my mates workshop the other day and a guy there was telling us about E85 fuel being available at a servo in newcastle, so i got the jerry can and off i went
got 10ltrs to try in the gemini and set about draining the fuel and modifying my tune to have E85 AFR's.
So the stoichiometric ratio of E85 is 9.765 so i used that to work out the difference between petrol, works out with petrol afrs converted back to lambda (petrol afr / 14.7) then allows you to multiply the afr table by 9.765 and that gives you an E85 afr table.
crank pulse widths and such are offset by 1.51 (as apposed to methanols 2.29).
anyways enough with the dribble about maths
heres a quick log i had running with E85 in the gemini, note that its always richer than commanded, this is correct as the methanol tune i had was too rich too.

- e85%20log.jpg (101.99 KiB) Viewed 4181 times
so as you can see theres a bit too much AE but the wideband generally follows the ups and downs of the commanded afr!
haven't really done anything other than a bit of fucking around in the shed, but it seems to rev ok and runs pretty well so im happy.
im thinking this is going to be my new fuel for when i don't have methanol in the car, its higher octane than petrol so i wont need octane booster and its not as corrosive as methanol so its a good option, and its a shitload cheaper than 98 octane petrol!