The invention relates to a method for determining the fuel consumption of a combination (K1 to K8) of a
towing vehicle (TR) with a trailer (AN), wherein fuel consumption data (VD) of a fleet of
towing vehicles (TR) with trailers (AN) are collected, wherein trailer information relating to the trailer (AN), including an axle configuration, a model (A, B, C, D) and a
vehicle identification number (I, 1, 2, 3, 4, 7), a
tire pressure, a tire temperature and / or a
brake application, is collected in the
towing vehicle (TR), wherein vehicle data of the towing vehicle (TR), including
energy consumption,
route data, speed data, a model (A, B, C, D) and a
vehicle identification number (I, 1, 2, 3, 4, 7), is recorded in the towing vehicle (TR), wherein a fuel consumption calculation is performed for a specific combination (K1 to K8) or for a structurally identical combination (K1 to K8) with a towing vehicle (TR). Type (A, B, C,D) and a trailer (AN) of the same type (A, B, C, D) is carried out using the information obtained for this purpose, wherein the consumption data (VD) of the fleet of towing vehicles (TR) with trailers (AN) are collected in a backend (BE) and / or in a cloud, wherein for certain configurations consumption-relevant parameters are resolved according to towing vehicle (TR) and trailer (AN), wherein the trailer information and the vehicle data are transferred to the backend (BE), wherein the consumption calculation is carried out on request in the backend (BE).