The production cost is the issue that kills most new chemical ideas. They are using levulinic acid as raw material. The price is USD2820/MT FOB Tianjin http://www.chinatopsupplier.com/d-p12496686-levulinic_acid_98_5/ that is USD 2.82/kg = 2.82*0.45/lb = USD 1.3/lb.
The density of petroleum diesel is about 0.85 kg/l (7.09 lb/US gal), about 18% more than petrol (gasoline), which has a density of about 0.72 kg/l (6.01 lb/US gal).
I have not made any further calculations, but it seems that it is a waste of money to process the levulinic acid.
Thanks AdmSmith.