http://forums.nasioc.com/forums/showthread.php?t=1971247 Saw this on nasioc. Interesting read even if it is nothing all that new...they have been exploring in Brazil for some time now I understand. I think they found they ran great up until around 16:1 in brazil on E100 http://www.sae.org/servlets/productDetail?PROD_TYP=PAPER&PROD_CD=2010-01-0619
This is one of the reasons we are going higher compression on my personal motor. It will be run on E85 primarily.