 And biofuel groups continue to call for a permanent solution to year-round E15. Monty Shaw with the Iowa Renewable Fuels Association says a yearly summer waiver isn't sustainable long-term. You're not going to have major adoption of E15 when major retailers don't know what they're going to be able to do the next year. So you need CERT. He tells Brownfield progress has been made with EPA allowing year-round E15 sales in eight Midwestern states beginning next year.