of the system. However, CJO has a much higher kinematic viscosity than diesel. Therefore, products with the identical E/S content but with a larger portion of CJO display a higher kinematic viscosity. LS1 displayed a greater miscibility (Fig. 1) in the phase behavior study, particularly at an E/S ratio of 1. In addition, LS1 yielded the lowestkinematicviscositycomparedto those ofLS3and LS7(Fig.2 and statistical analysis in Appendix F). Therefore, the LS1 surfactant is the most appropriate for this Jatropha biodiesohol investigation. The most appropriate E/S ratio and E/S content of LS1 are at 4 and 20, respectively significantly reduce kinematic viscosity and achieve the desired kinematic viscosity; however, the difference in viscosity was insignificant when compared to an E/S ratio of 3 (Fig. 2). When considering the heating value and storage, a high content of ethanol would provide a low energy content and low flash point. Thus, an E/S ratio at 3 is considered the best ratio for Jatrophabiodiesoholproductioninthispresentstudy.Atthispoint, a kinematic viscosity of biodiesohol at the compositions of both 20% and 25% of CJO and E/S content at 5% and 10% with an E/S ratio of 3 satisfied the biodiesel standard (3.5–5 mm2 s1 at 40C).