Method for determining a prediction quality for a predicted energy consumption of a motor vehicle comprising the steps: a) providing a plurality of manoeuvre classes to which at least one input speed and one output speed of a vehicle are associated as defining variables; b) repeated implementation of the manoeuvre in each manoeuvre class by a driver with the vehicle and determining average values for speed or change of speed depending on the number of repetitions of the manoeuvre; c) repetition of step b) at least until a statistically meaningful average value for speed or change of speed is obtained for each manoeuvre; d) computing a tolerance range for the average values of each manoeuvre with maximum and minimum values for the average speed or the average acceleration depending on the number of repetitions of each manoeuvre; e) selecting a predetermined route using a second data record, by which a plurality of routes with a plurality of route segments are defined; f) assigning at least one manoeuvre class to each segment of the route; g) computing the predicted energy consumption for the route by the addition of the predicted energy consumption of the vehicle for each manoeuver carried out along each route segment using the determined, statistically meaningful average value for speed or change of speed for each manoeuver, and h) computing a tolerance band for the maximum and minimum energy consumption by the addition of the energy consumption of the vehicle for each manoeuvre carried out along each route segment using the maximum and minimum average values for the speed or the acceleration determined in step d) depending on the number of repetitions of the manoeuvre, wherein deviations within and/or between different manoeuvre classes are compensated by using the formula for Gaussian error propagation. a) providing a plurality of manoeuvre classes to which at least one input speed and one output speed of a vehicle are associated as defining variables; b) repeated implementation of the manoeuvre in each manoeuvre class by a driver with the vehicle and determining average values for speed or change of speed depending on the number of repetitions of the manoeuvre; c) repetition of step b) at least until a statistically meaningful average value for speed or change of speed is obtained for each manoeuvre; d) computing a tolerance range for the average values of each manoeuvre with maximum and minimum values for the average speed or the average acceleration depending on the number of repetitions of each manoeuvre; e) selecting a predetermined route using a second data record, by which a plurality of routes with a plurality of route segments are defined; f) assigning at least one manoeuvre class to each segment of the route; g) computing the predicted energy consumption for the route by the addition of the predicted energy consumption of the vehicle for each manoeuver carried out along each route segment using the determined, statistically meaningful average value for speed or change of speed for each manoeuver, and h) computing a tolerance band for the maximum and minimum energy consumption by the addition of the energy consumption of the vehicle for each manoeuvre carried out along each route segment using the maximum and minimum average values for the speed or the acceleration determined in step d) depending on the number of repetitions of the manoeuvre,