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The global trend, enshrined in international agreements is a reduction of carbon dioxide emissions. This applies to all sectors of the economy, including of course the automotive industry. In the latter case, it is quite important because almost all the fuels used to power vehicles comes from non-renewable resources. Consumption of these fuels is a unilateral move coal from underground to the earths atmosphere, wherein the oxygen is bound in carbon dioxide. The pumping into the atmosphere of carbon dioxide must be immediately stopped. It happened (finally) understood by most people in the world - was therefore (for several years now) in this direction more activities are happened. These are the actions of both legislative and technical. Reports published in 2016 indicate, however, that despite the efforts and resources considerable effects are mediocre. Since CO2 emissions are quasi directly proportional to fuel consumption in the article addresses the issue of fuel consumption as relevant for the CO2 emission. It is noted that although achieved to reduce emissions of carbon dioxide (fuel consumption) to be fixed in the test bench is no visible progress in the natural operation of vehicles. The reasons for this state of affairs are attributed to the mismatch of the test conditions to the real operating conditions of vehicles. In the article, reference was made to this issue and proposal a way to solve the problem is given, namely it is suggested a different approach for determining the fuel consumption in the operation in natural conditions and wider use of test data in order to achieve a correlation between test and operational fuel consumption.