Learn about EV technology: br Ford Focus Battery Electric Carbr br Only about 15 of the energy from the fuel you put in your tank gets used to move your car down the road or run useful accessories, such as air conditioning. The rest of the energy is lost to engine and driveline inefficiencies and idling. Therefore, the potential to improve fuel efficiency with advanced technologies is enormous. With an Electric Car it costs just $1.00 per 100kms with MUCH more performance than with petrol at $20.00 per 100kms.