Abstract: The invention relates to rating monitoring devices.A first circuit emits a pulse for each centiliter (cl) of fuel consumed by a vehicle. A second input circuit emits a pulse for each meter travelled, the pulses being accumulated in a count meter. A store circuit stores a certain number of values previously contained in the count meter at the moment of the preceding pulses of cl consumed. Information about the mean distance travelled per 10 cl of fuel is obtained by producing the difference between the content of the count meter or that if the first register in a register battery, and the content of the last register of the battery. A divider allows this information to be converted into mean consumption per 100 km, this consumption being displayed in a display device.This invention finds application, in particular, to car.