**4. Conclusions**

In view of the current need for alternate fuels to supply the growing energy demand and also comply with new environmental requirements related to its renewable character, the objective of this research was to evaluate the potential of ethyl acetate as renewable biofuel in double blends with two different straight vegetable oils, castor or sunflower oil, and also, in triple blends along with fossil diesel. For that, the influence of these fuel blends on efficiency and emissions of a C.I. diesel engine was investigated. Considering the experimental results, the following points are concluded:


**Author Contributions:** D.L. designed the study; L.A.-D. performed the experiments and wrote the paper; R.E. reviewed and edited the paper; R.E., D.L., and F.M.B. supervised the study and revised the manuscript; C.L., J.H.-C., J.C., A.P., and A.A.R. made intellectual contributions to this study. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Acknowledgments:** The authors are thankful to MEIC funds (Project ENE 2016-81013-R), to Andalusian Government (UCO-FEDER Project CATOLIVAL, ref. 1264113-R, 2018 call) and to Spanish MICIIN (Project ref. PID2019-104953RB-100), that cover the costs to publish in open access.

**Conflicts of Interest:** The authors declare no conflict of interest.
