Furthermore, superior volatility of PODE is also beneficial to improve the oxygen utilization in the fresh air. It clearly shows that blending PODE can dramatically reduce the CO emission, especially at high load conditions with high EGR. The HC emission is higher for all fuels at low load than at high load because of the over-lean mixture and low in-cylinder temperature. At medium or high load, HC emission is extremely low due to the high combustion temperature and high cylinder wall temperature, thus the incomplete combustion and wall quenching phenomenon can be reduced. Therefore, the high oxygen content of PODE blends can hardly present its capability to reduce HC emission at this condition.