[Gmecm] E85 conversion

[SubZero350@att.net]

I know this topic has been talked about in the past but one of our local gas 
stations has just recently been approved by the state to sell E-85.  Now 
that this is coming to my town, I would like to know a few more specifics 
about what exactly it takes to run E-85.  I found the following website but 
it did not answer all my questions...

http://www.e85fuel.com/index.php

Hopefully someone on this list will know more about E-85 as I have specific 
questions.

1) Exactly what components in the typical GM fuel system are NOT compatible 
with E-85?  (Obviously I know rubber O-rings and fuel lines are not, but 
what about steel and plastic?)

2) Since I have the ability to tune nearly all the ECMs/PCMs in the cars I 
own, resetting A/F ratios or widening the INT/BLM operating windows won't be 
a problem.  Do I need to alter the R/L O2 voltage tipping point?  If so, to 
what?

Thanks for the info in advance.

-ryan