I run 93 in mine, and if i remember correctly the minimum is 91. So you should be fine either way. There are a few good threads about octane ratings here on the forum. Here is one suggesting that higher octane may give you better performance (at least in the MPG category).....

https://www.crossfireforum.org/forum...91-octane.html

Do a search on octane rating or ethanol and you should find some useful information.