Well, I have a small anecdotal input as well as some ranting to feel better...
In Oregon there are counties that are required to pump E10 and some that are not, mostly the farm counties.
They have pumps labeled E0 Farm use only.
My 94 Jeep with a 2.5 4cyl thats been rebuilt with power in mind gets a consistent 17Mpg when driving from the Portland Oregon area.
When I get to the dry side of the state out east, and fill with the E0 I immediately get a nice 4 or 5 MPG bump. Very consistent and repeatable for the last 7 years.
BTW E85 is 15 percent Eth becasue if it was E100 any chemical company could distribute and haul it, with over 5% Gasoline you have to be a Oil distributor to stock and sell it.... Hmm.
My farmer relatives in Nebraska tell me that ANY crop they can get cash for that makes bio-diesel or alcohol needs to have 2x the fertilizer of crops grown for food. And Chevron is the biggest manufacturer of fertilizer... besides cows... Grow soy and you get the double win of pumping chevron and Monsanto... Wheeeeee
Cane is an awful top soil destroyer and needs massive amounts of fertilizer or fresh ground to grow it on,,, IE rain forest. about 80% of the ethanol in our gas comes from Brazil...
I work on a 850 HP methanol burning sprint car, we spend hours cleaning crud out of the injection system.
But if you are running alcohol there is a Product from Klotz called uplon that works wonders at stopping the corrosion issues...
Just some random thoughts form the peanut gallery....
Dave