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A few months back I was wondering about the actual octane of E85 (since all the usual web sites seemed to me to be quoting each other) so I went web searching and found this document:
http://ethanolrfa.3cdn.net/dd9e74ce1c454a97cc_rbm6bdgh3.pdf
It's full of good information about fuels, historical and current, and how and why various changes were made over the years. It also includes a chart for determining the alcohol content of a blend and it's a LOT more complicated than those cute little test bottles sold by the web sites that encourage E85 use. It also includes a statement of the octane of E85 that's sure to PO a lot of people who've accepted and quoted the number found on so many web sites. I found it interesting reading, you may not.

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These questions have been popping up lately on E-85. I am also considering the changeover. So...Let's have some good input on this. Likes? Dislikes? Tips? Thanks,guys!!

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I know most of the stuff quote in the article I do
disagree with his octane rating.. there is only 1
way to test true octane and thats on a knock engine
and I am sure he doesnt have one... we wrote our own
data base for release(Chrysler Fuel Lab which I was
part of) and we had to base the octane on US release
data since they are one of the few places that has
a knock engine... my own results say that its higher
than he posted.. my engine would be knocking big time
if it was low 90s....
As to the oil question that would be the only one I
have heard of... Chrysler doesnt spec any one oil
to stay away from... unless Penn feels that it could
be diluted on short cold runs on a drag strip..
otherwise I have no clue