I know I've steered this thread away from the OP's original questions, sorry about that.
That above link is pretty good.
I've personally worked with E85 almost 10 years now. I had it on my DD Subaru that I tuned and converted myself and ran it for around 30k miles. The smell is just awesome, slightly sweet, not gas-like or chemically... so fun.
Anyhow, all you need is:
- a tune... and a tuner that is comfortable with it (this is the most important part).. if your tuner has doubts or hasn't worked with it, move on... on this car you'd be changing the stoich, then running a little more boost and timing to take advantage of the fuel... maybe tweak a few other settings like tip-in and fuel trim parameters.
- fuel system upgrades (depends on how much head-room the stock system has... most applications require injectors and or a fuel pump (boost-a-pump works fine).
There are some drawbacks. The biggest is cold-starting. On my Subaru, on a dead cold motor at 50F or more you would never know what fuel I was running or that anything was different. From 20F-50F, the car starts, but it requires a few extra cranks, especially under 30F. At temps of 20F or less, it will not start with E85. On my Ford, my tuner kinda sucks, and it was a bit worse... The other drawbacks are availability (you have to plan ahead to fuel up) and fuel inconsistency. E85 is actually anywhere between E70 and E85... my Subaru could handle fuel variations beautifully but my Ford didn't do as well. On the Ford I actually tested E85 fuel at the pump... that's certainly not for everyone... but I blame that more on my tuner than anything....