In the current climate debate, electric vehicles are widely considered to be the future of individual transport. The REV Project of the University of Western Australia has converted three regular petrol driven cars to electric vehicles. This thesis focusses on the user interface for one of those vehicles, taking into account the special requirements of electric cars. The thesis begins by analysing existing solutions and evaluating the important features of those systems (Chapters 2 and 3). In addition, special requirements for test driving a prototype car are de�ned. These features are essential for the REV Project to evaluate the performance of the cars. It then describes the general ideas behind the development of the program and details their implementation (Chapters 4 and 5). This includes communication with the battery management system, processing of GPS data, calculation of statistics, generation of a map and control of the multimedia functionality. Lastly, the thesis explains the resulting program (Chapter 6), discusses experiences in using it and presents data collected during test drives (Chapter 7).