*Editorial* **Special Issue on Frontiers in Hybrid Vehicles Powertrain**

**Marco Cammalleri \*, Vincenzo Di Dio and Antonella Castellano**

Department of Engineering, University of Palermo, 90128 Palermo, Italy; vincenzo.didio@unipa.it (V.D.D.); antonella.castellano@unipa.it (A.C.)

**\*** Correspondence: marco.cammalleri@unipa.it
