In a years-long, ongoing policy battle, a provision to secure E15 was dropped at the last minute from the appropriations bill. On paper, the path forward looks clear, as the oil refiners’ association is now onboard with E15; however, there are still many other smaller mechanisms in the legislation that must work out.   For context, E15 has a checkered and complicated history. Across most of the country, E15 is prohibited from being sold from 1 June through 15 September based on its emissions, measured by a benchmark known as the Reid vapor pressure (RVP) as set in the Clean Air Act (CAA). To avoid this prohibition, the EPA can issue a waiver of the statute for cause. Achieving E15 has long been an industry goal. In 2019, the...