According to the Fuels Institute’s latest report, “Retailing E85: An Analysis of Market Performance, Jul 2014-Aug 2015”: The price of unleaded seems to have little effect on E85 sales. Linear predictions that seek to forecast E85 sales volumes based on price relative to unleaded are not reliable. Energy parity does not seem to factor significantly in E85 pricing decisions. Lower volume stores reported stronger E85 sales in both gallons and percent volume. Click for report