A system for determining current and potential ranges of a vehicle includes a sensor that is used to detect energy data corresponding to an amount of energy remaining in the vehicle, such as fuel in a gasoline engine or fuel cell or a state of charge (SOC) of a battery. The system also includes a processor that can determine a current range of the vehicle in at least one direction based on a current status of the vehicle and the remaining energy levels. The processor can also determine a potential range of the vehicle that can be achieved if at least one user-controllable factor is changed from the current status of the vehicle. The system also includes an output device for outputting the current range of the vehicle and the potential range of the vehicle. The system may show fuel and/or recharging stations within the current and potential ranges.