A measuring device of the motor vehicle engine fuel consumption.

This interactive device comprises an electronic unit (16) installed in the engine compartment and a pocket microcomputer (54) removably installed in the passenger compartment. The housing (16) receives the pulses and consumption course produced by an injection calculator (10) and a distance sensor (22) driven in rotation by a flexible cable (24). The housing (16) periodically reviews the microcomputer (54) the numbers N and M of pulses counted for a given period. The microcomputer (54) calculates and displays on the screen (58) Instant consumption and / or medium, on time and per hundred kilometers, from calibration factors in consumer impulses and Fc and Fp calculated route on demand, on the operator's instructions. Application to the verification of all injection engines in the garage and factory workshops.