Ethanol blends of 10 to 25 percent could potentially have more fuel pump compatibility issues than higher blends, according to a study conducted by a team led by Mike Kass of Oak Ridge National Laboratory's Fuels and Engines Research Group.
"Many scientists had thought that higher ethanol blends – especially those exceeding 50 percent – would have the poorest properties, but that doesn't' appear to be the case," Kass said.