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In last years environmental complains and instable petroleum prices have brought up a necessity to develop more efficient vehicles, witch shows less fuel consumption. With this aim better projected engines are being put into market utilizing renewable fuels like brazilian ethanol. Another fundamental way to improve efficiency is minimizing the resistance furnished by the vehicle to air flowing through during a translation. This resistance reduction known as Drag is one of the main objectives of Vehicle Aerodynamic science. A low drag vehicle might be considered as more susceptible to air flow instabilities, as wind gusts, resulting in unsafe situations to its occupants therefore this material intends to demonstrate the vehicle drag and aerodynamic stability are distinct concepts and it is possible have a drag efficient car without losing drivability. The use of Basic Models geometry to demonstrate aerodynamic concept is a feature defunded in automotive industry.