Trump also rolled out new fuel standards that will be a boon for Iowa and other farm states that have pushed for greater ethanol sales. The long-expected change will lift the federal ban on summer sales of gasoline with high-ethanol blends and allow them year-round. The EPA currently bans the high-ethanol blend, called E15, during the summer because of concerns that it contributes to smog on hot days. Ethanol industry advocates say that fear is unfounded.