All I know is, I dropped the gas tank on my '92 to replace the fuel pump; I've been running lots of straight E85 through it and it looked as new and clean as a whistle as the day it was made.
Yeah, I know- replacing the pump. Well it's 22 years old and who knows if the pump would have failed if it had never been exposed to a single drop of ethanol in that time.
Also, I just completed a trip with the F150 pulling the flatbed; filled with straight E85 for
$2.41/g 
then topped off with regular close to home. Got 16 mpg, which is just as good as I could hope for with E10 yet saved over $1/g.