By hybrid car we refer to any vehicle that relies on two separate power sources for propulsion. Among the power sources for a hybrid car there are gasoline or diesel fuel, on-board or out-board rechargeable energy storage systems (RESS), hydrogen, wind, compressed or liquid natural gas, solar, coal, wood or other solid combustibles, etc. The very concept of hybrid car designates electric vehicles that adapt the usage of an internal combustion engine to that of the electrical batteries.
