Currently the only fuel in my area has 10 percent alcohol and 90 percent gasoline.
It works OK in my vehicles but something that is 85% alcohol would be pure shit in my book.
The only thing I find in my 2011 G5 Owners Manual about alcohol fuel is
"Fuels containing methanol should not be used as it can cause damage to the fuel system components"
That pretty much screws anyone who owns a RE in my area if they want to live by the "book".
As for the numbers shown on a fuel pump, here is a pretty good explanation of what they mean
"Gasoline pumps typically post octane numbers as an average of two different values. Often you may see the octane rating quoted as (R+M)/2. One value is the research octane number (RON), which is determined with a test engine running at a low speed of 600 rpm. The other value is the motor octane number (MON), which is determined with a test engine running at a higher speed of 900 rpm. If, for example, a gasoline has an RON of 98 and a MON of 90, then the posted octane number would be the average of the two values or 94. "
http://chemistry.about.com/cs/howthingswork/a/aa070401a_2.htmThe RE Owners Manual says 87 RON is the minimum so I think if the number is larger than 87, even if it is the (R+M)/2 it should work fine.