"Optimal Blend" Is Likely E20 or E30; Coalition Calls for Further Government Research SIOUX FALLS, S.D., Dec. 5 /PRNewswire-USNewswire/ -- Research findings released today show that mid-range ethanol blends--fuel mixtures with more ethanol than E10 but less than E85--can in some cases provide better fuel economy than regular unleaded gasoline, even in standard, non-flex-fuel vehicles. Previous assumptions held that ethanol's lower energy content directly correlates with lower fuel economy for drivers. Those assumptions were found to be incorrect. Instead, the new research strongly suggests that there is an "optimal blend level" of ethanol and gasoline--most likely E20 or E30--at which...