90# gasoline, and 3HBME-based and 3HAME-based blended fuels and found that
3HBME and 3HAME had combustion heats of 20 and 30 kJ g−1, respectively,
comparable to the combustion heat of 27 kJ g−1 of ethanol. Addition of 10%
3HBME or 3HAME enhanced the combustion heat of ethanol to 30 and 35 kJ g−1,
respectively. The addition of 3HBME or 3HAME to n-propanol and n-butanol led to
a slight reduction of their combustion heats. The combustion heats of the blended
fuels 3HBME/diesel or 3HBME/gasoline and of 3HAME/diesel or 3HAME/gasoline
were lower than that of the pure diesel or gasoline. It was roughly estimated that
the production cost of PHA-based biofuels should be around US $1,200/ton.