If the yield of bio-oil to liquid fuels (gasoline- and diesel-like fuels) is 42 wt.%, what is the overall energy efficiency? Use the values in Table 4.12: for energy content and product yields. First, calculate the biomass to liquid fuel yield based on the biomass to bio-oil and bio-oil to liquid fuel yields. Finally, assume a liquid fuel energy density of 41.2 MJ/kg and calculate the energy efficiency.