The Traffilog system analyzes actual vehicle fuel consumption at any given time by consistently reading the vehicle's engine consumption and fuel tank levels. Analysis is performed without connecting additional sensors to the vehicle, providing comprehensive reports and graphs. Fleet managers can easily keep track of the exact fuel consumption of any vehicle and receive real-time information on related events, such as refueling and fuel theft, in addition to efficiency analysis and comparison between different vehicles, models and manufacturers. The system also generates timely reports on fuel consumption per trip, driver, or time period, according to pre-defined customer requirements.