Mike Wilmes owns two hardware stores in South Dakota, where he has seen an influx of repair work for small engines that have used gasoline with ethanol in it. With the change in how gas is distributed to stations, he is afraid he'll see even more repair needs. "The ethanol degrades some of the plastic parts in the carburetor," he explains. "It makes them mushy. The more it sits in there, the more it breaks it down, and gums it up."