I agree if E85 is only 30 cents a gallon cheaper, it's not economical to use. There are stations here that are exactly that way. Kwik Trip sells their E85 for 30 cents a gallon less than their regular gasoline. Which means one thing...They're making more money off the E85 than they are off the gasoline, since E85 is exempt from road tax, which here equates to 54 cents per gallon.
The Renew E85 stations I fill up at are roughly a buck a gallon less than gasoline. The ethanol is produced locally, and I'm sure they're still making money on it. The stations are unique too...They have both gasoline (E10) and E85. There's two tanks in the ground. One with straight gasoline, and the other with straight ethanol, and the blend is done right at the dispenser. You can here the solenoids cycling when you're filling up. They cycle much faster with gas than with E85. This may be another reason why it's cheaper...The Kwik Trip stations have to transport the E85 pre-blended at their main facility to the stations.
I like it when a new Renew E85 station opens up somewhere. The day of that station's grand opening, all the Renew stations sell E85 for 85 cents a gallon! Next time, I'll be there with about 10 fuel cans along with an empty tank!