Even non-flexible fuel vehicles can run on up to 10 percent ethanol, or E10, but the Department of Energy, the United States Environmental Protection Agency and others have begun studying the idea of introducing "intermediate" gasoline blends that contain 15 or even 20 percent ethanol.
Novacek and Maher urged caution. They said higher blends could damage vehicles not optimized to handle high concentrations of ethanol. Also, they said, many non-vehicle engines, such as those found on lawnmowers, may not be able to handle more ethanol.
The EPA is pushing to get E15 and E20 in pumps? That's news to me.