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Operational tests are becoming the primary type of vehicles tests. This is due to the fact that it is difficult to find a correlation between the vehicles performance recorded in the various model tests carried on the chassis dynamometer and such designated performance in the natural exploitation. One of the reasons for this is that the data from the natural exploitation are underused fully analyzed . The subject of the paper is to show that the standard data from the natural operation of the vehicle can be widely used for deeper analysis on the characteristics of the vehicles. Data for the analysis were obtained after testing the car during the drive on the highway. Vehicle was operated, without and with the use of cruise control. We analyzed the dynamics of operating fuel consumption. As a result of the statistical data analyze it was possible to demonstrate the fundamental differences in the engine load and its speed and the resulting differences in operational fuel consumption. In a further analysis of the fuel consumption are used the theory of cumulative fuel consumption . It was found that the theory is suitable to describe the operation fuel consumption. The theory of cumulative fuel consumption is more reliable to describe the fuel economy in the operation of a vehicle using the cruise control. From the presented analysis shows that the use of the latest mathematical methods, especially the theory of cumulative fuel consumption, allows you to obtain more information about the parameters of the vehicle in its exploitation in natural conditions.