E12 faces environmental battle
The group approached the U.S. Environmental Protection Agency (EPA) on 28 September to deny the request.
In a letter to EPA Assistant Administrator Gina McCarthy, the organisations express concerns regarding the lack of independent testing on mid-level ethanol blends. The letter says increasing levels of ethanol in petrol could pose a danger to consumer safety and could harm engines and the environment.
Current law limits the amount of ethanol in conventional petrol to 10%.
EPA is expected to announce a decision on the use of E15 in late-model cars in the next few weeks. Ethanol producers backing E15 have also sought approval for the use of E12 for a wider range of vehicles.
The protesting groups include the Natural Resources Defense Council, National Consumers League, Association of International Automobile Manufacturers, Outdoor Power Equipment Institute, National Marine Manufacturers Association and Grocery Manufacturers Association.