**4. Conclusion**

• Increase in the percentage of the blend ratio of WPPO shows a marked decrease in the engine brake power compared with conventional diesel. This is due to lower percentage of the energy content presented in **Table 2** for WPPO test fuel compared with conventional diesel test fuel.

*The Influence of Exhaust Gas Recirculation on Performance and Emission Characteristics… DOI: http://dx.doi.org/10.5772/intechopen.105011*

