With the US Environmental Protection Agency poised to possibly decide whether to permit more ethanol in motor fuels, a new study commissioned by the American Petroleum Institute said multiple regulatory and legal requirements remain before higher ethanol blends can be legally marketed."Our study found that the introduction of higher-level blends into the marketplace is not simple or straightforward," said Jim Lyons, a senior partner at Sierra Research Inc., which conducted the study for API. "There are many changes that need to be made to federal, state, and local requirements as well as issues with vehicle warranties and the country's fuel distribution and marketing infras...