Also this article from your home state.
"But it also allows a 20% exemption for 20% to 50% ethanol blend gasoline and a 100% tax exemption for E85 fuel"
Illinois approves fuel sales tax incentive for E15 gasoline
SPRINGFIELD, Ill. (WTVO) — A new fuel sales tax incentive in Illinois gives gas stations a tax exception if they sell gasoline with a higher blend of ethanol. Senate Bill 1963, signed into law by G…
www.mystateline.com
"But it also allows a 20% exemption for 20% to 50% ethanol blend gasoline and a 100% tax exemption for E85 fuel"