1. An electric taxi predictive performance system, comprising: an electric based taxi system configured to link to a vehicle; a vehicle data input module that gathers operating data of the vehicle; an electric taxi input module that gathers performance limits of the vehicle; a map database module that stores maps of an area in which the vehicle can taxi; a vehicle database module that stores vehicle type data; a real-time map module that provides real-time location of the vehicle in an area in which the vehicle is taxiing; a performance modeling module that uses the vehicle data input module, the electric taxi input module, the map database module, the vehicle database module and the real-time map module to provide predicted electric based taxi performance; and wherein the performance modeling module is configured to: determine if environmental data is known, receive environmental data if environmental data is known, continuously determine over time predicted electric based taxi performance based on the environmental data if the environmental data is determined to be available, or based on worst case data if the environmental data is determined to not be available, and cause to be displayed predicted electric based taxi performance that is changing over time; wherein the displayed changing predicted electric based taxi performance is accompanied by a displayed changing confidence value of the changing predicted performance that is calculated using data comprising vehicle weight, weather conditions, and frictional coefficient of the path; wherein the displayed, changing predicted electric based taxi performance and the displayed changing confidence value enable an operator of the vehicle to manipulate the electric based taxi system and thereby avoid inefficient electric taxi operation of the vehicle.