System and method for determining the energy requirement of a vehicle for a journey

A computer implemented method for determining energy requirement of a vehicle for a journey, the method comprising:

• obtaining journey data;
• obtaining vehicle data associated with the vehicle;
• obtaining non-vehicle data;
• predicting using a predictor mechanism with an energy prediction algorithm, a vehicle energy requirement for the journey from the journey data, vehicle data and non-vehicle data;
• adjusting the energy prediction algorithm for the vehicle by:
• determining for each of a number of historical journeys undertaken by the vehicle, an error between an actual vehicle energy usage for the historical journey and a predicted energy usage derived using the energy prediction algorithm for the historical journey from historical journey data, historical vehicle data and historical non-vehicle data, each historical journey of the of the number of historical journeys being associated with a respective error of a set of errors;
• determining an aggregate error from the set of errors;
• and
• adjusting the energy prediction algorithm to reduce the aggregate error;
• and
• updating the energy prediction algorithm with the adjusted energy prediction algorithm.