Donald Stedman has never been a fan of ethanol. Stedman, a chemistry professor at the University of Denver, said there are several problems that messed up the fuel pump in a car he uses. Brooke Coleman is a big fan of ethanol. Coleman, executive director of the Advanced Ethanol Council, said there are a lot of misconceptions about the type of fuel. The two men are on different sides of a debate that is increasingly under a political and public microscope.