Strangely, Dr. Tillman's main conclusion was left out. While Tillman demonstrated that Celulosic Ethanol (Ethanol from random plant matter)was more efficient than corn ethanol or soy Biodiesel, the most efficient by far was Fischer Trop (FT) Biodiesel (Biodiesel made through a complex gasification and liquification of random plant matter, also called BTL).
Sadly, this is never mentioned in most articles. This FT technology ALREADY exists (since WWII) and is being implemented in Europe. The FT refineries are god-awfully expensive, so government-scale money is needed, but at least the technology is known and extant. Money thrown at Cellulosic Ethanol technology seems kinda a waste when we already have a more efficient random biomass-to-liquid fuel technology. VW, for instance, thinks that plant-oil biodiesel (usually rapeseed in Europe) is a huge waste of time and chastised the governments for not concetrating on FT Biodiesel.
Wanna see a FT plant?:
http://www.choren.com/en/
That's the future, but the future costs money...