The U.S. Environmental Protection Agency may not meet a December 1 deadline to decide whether to approve an industry request to boost the amount of ethanol that can be blended into gasoline, EPA Administrator Lisa Jackson said on November 9.

The pro-ethanol trade group Growth Energy and 54 ethanol manufacturers petitioned the EPA last March to allow gasoline rated as standard transportation fuel to contain up to 15% ethanol by volume, known as E15. U.S. gasoline is now approved to contain up to 10% ethanol. The group filed the request as an emergency waiver appeal to forego the usual multi-year data gathering and research process associated with such fuel changes. According to agency rules, the appeal required a yea or nay response within six months, but agency officials now say that time frame won’t likely be met.