@ CHicada- This is interesting news, especially considering the USDA is studying this. This is a good indicator that we may soon see a shift in the source for ethanol gas production in the United States. This could be a viable alternative to corn and sugarcane ethanol production until enough research and development can be done to make cellulosic biomass ethanol production economically competitive. I will be watching the markets closely for indicators of success in sweet potato ethanol. I will also spend some time doing more research on this area. A viable substitute will be needed to reduce fossil fuel dependency, and from the sounds of it, this could be a promising source for ethanol production.