This invention relates to methods and means of measuring fuel consumption of vehicles propelled by combustion engines, and of stationery combustion engines. This invention relates also to methods and means of generating electrical signal in proportion to the speed of the vehicle, particularly sailboats and sailplanes, whether propelled by an engine or not. In the case of stationery combustion engines, the invention relates to methods and means of generating electrical signal in proportion to the flow of the fuel, and utilizing these electrical signals to give the operator instantaneously information about fuel consumption, preferably in gallons per hour, of the engine. In the case of vehicles propelled by combustion engines, the invention relates to methods and means of generating electrical signals in proportion to the speed of the vehicle, and of utilizing these electrical signals to give the operator of the vehicle information about fuel consumption per unit time, preferably in gallons per hour, to give the operator information about fuel consumption per distance travelled, preferably in miles per gallon, and to give the operator information about speed of the vehicle, preferably in miles per hour.