A vehicle fuel consumption measurement system comprises a digital storage for storing information on the fuel consumption, and related to location. The system includes a fuel flowmeter installed between vehicle's fuel tank and engine. The information is stored for the duration of a predefined itinerary. A fuel consumption measurement method comprising: storing a rate of vehicle fuel consumption; integrating over a specific path; multiplying by cost of fuel; tagging each path with information re a plurality of variables for each travel; storing information for the paths. A control center is used to monitor and advise a plurality of cars how to reduce fuel consumption.