The Average reported price spread between gasoline and E85 is 29% and in large part because of the Kum & Go (Kwik Star) Stations in the State. http://e85prices.com/iowa.html
It is extremely important for consumers to be aware of the price spread so they can determine when it makes financial sense to run E85 and when it doesn’t (that’s the beauty of your flex fuel vehicle). In Iowa with a average price spread of 29% every FFV E85 driver is coming out ahead over the gasoline driver on cost per mile.
As Lucy Norton was pointing out is the Miles Per Dollar that matters (not mpg) Feel free to use our (E85Prices.com) miles per dollar calculator to determine what prices make sense for your vehicle http://e85prices.com/milesperdollar.htm