In 2009, Growth Energy requested that EPA approve E15 for use in all vehicles and engines under Section 211(f) of the Clean Air Act (CAA). As of August 10, 2011, E15 is not registered with EPA and is therefore not legal for distribution or sale as a transportation fuel. [1]
As noted by EPA, before E15 can be sold and distributed, there are a number of additional steps that must be completed. Many of these steps are outside of EPA's jurisdiction.
Based on the findings by Sierra Research in a report commissioned by the American Petroleum Institute (API), Identification and Review of State/Federal Legislative and Regulatory Changes Required for the Introduction of New Transportation Fuels, multiple regulatory and legal requirements remain and must be met before higher ethanol blends can be legally marketed for commercial introduction.
[1] http://www.epa.gov/otag/regs/fuels/additive/e15