Getty Images Court looks at EPA’s interpretation of Clean Air Act holding E15 to the same gasoline volatility standards as E10. On Tuesday, the D.C. Circuit Court heard oral arguments in American Fuel & Petrochemical Manufacturers, et al. vs. EPA, a case in which oil refiners challenge the Environmental Protection Agency’s 2019 rulemaking that paved the way for the year-round sale of E15. Growth Energy, the Renewable Fuels Association, and the National Corn Growers Association defended the rule and also argued in support of upholding the rule allowing the 1-psi Reid Vapor Pressure waiver that currently applies to E10 during the summer months. Under the finalized expansion in May 2019, E15 was allowed to be sold year-round without additional RVP control rather than just eight months of the year.