On the one hand, fossil fuel inputs for growing the biomass will likely be much lower than for corn. (resilience.org)
I'd like to have seen a table giving the various energy and fossil fuel inputs for the calculation, if only to see what the biggest inputs are. (theoildrum.com)
When its humid, lots cold / humid air would enter your engine chamber while the existing fuel input is less. (mechanics.stackexchange.com)