Good alternative for diesel fuel and petrol is gas. It is about half the price of diesel and fuel-powered vehicles and emit significantly less harmful compounds in exhaust gases, eg. CO 2 emissions are reduced by approx. 10-15%. For the introduction of natural gas as fuels used to power vehicles and installations supports also one argument, in the twentieth century, energy consumption has increased more than fifteen times, while fossil fuels like coal, oil, natural gas is the main source of energy. According to the International Energy Agency, transportation as one of the fast growing sectors of the economy consumes approx. 26% of the main sources of energy, especially oil, which deposits are of successively depletion. If oil consumption will grow at the same rate as before, then how provide forecasts to meet the needs of the world of vehicles fleet for the use of only petroleum fuelsit will be impossible for approx. twenty years and the other power technologies (eg. hydrogen fuel) are not yet refined. Natural gas may therefore be called as transition fuel between oil fuels and other technologies to power vehicles or installations.