Jim:
I’m sorry, but that Wikipedia article gave you bad information. It’s describing the situation for E10, not E85. You’ll note it doesn’t give you a reference to a study backing up this analysis. On the other hand, this Wikipedia.page does: Ethanol Fuel Mixtures [1]
The key graph is on page 32 of that reference [2]
Similar graphs and conclusions agreeing that the sensitivity to phase separation declines as the percentage of ethanol increases are available elsewhere:
From the US EPA [3]
From Cim-tek [4]
Regards, – PNG
JWR Replies: Thanks for correcting my error. My humble apologies for not researching my reply more thoroughly. One of the things that I love about SurvivalBlog is the breadth and depth of knowledge that is possessed by the readership. If I err, I don’t hesitate in posting a correction.