This paper discusses the efficiency of an electric car and a conventional car. At the time when many car manufacturers are developing electric car prototypes , it is of great importance to investigate their efficiency. The paper presents an efficiency analysis of main components in an electric car. Energy consumption is obtained by performing drive cycle energy consumption simulation, which does not consider losses in the vehicle and by using declared consumption data where losses are considered. These two data sets have been used to calculate overall efficiency. Key words: Battery, conventional car, efficiency, electric car