Nowadays the trend toward the use of transportation technologies which are clean and less dependent on fossil fuel is highly increased. That is because of the fast depletion of oil reserves in the world, on the other hand the growth of developing nations into industrialized one’s will increase the demand on the energy sector , in which transportation occupy a large percent of it. This increase of transportation sector will affect the environment as a result of greenhouse gases. In this paper the use of several types of clean energy vehicles is demonstrated compared with classical internal combustion engine one’s, with statistical demonstration and the energy conversion chain, also the impact of hybrid vehicles on the petroleum reserves and consumption rates will be discussed using some mathematical equations.