U-S Senator Chuck Grassley of Iowa is confident President Biden will approve E-15 ethanol for year-long usage.  Grassley says President Biden has said he would look at all available options to reduce the high cost of gasoline.  Unless the Environmental Protection Agency changes its position, E-15 blended ethanol will be discontinued for the summer use as of June 1st.  Grassley says the model used to measure emissions from bio-fuels is out of date, and officials need to adopt new technology that is now available.  The Iowa Senator says he has joined South Dakota Senator John Thune and Minnesota Senator Amy Klobuchar in asking the EPA to adopt the new measures.