The automotive market is, nowadays, one of the most competitive and innovative in the eld of transportation: optimization, e??ciency and emission reduction are probably three of the main key concepts. Generally, a vehicle can be treated as a blu body, even if years and years of aerodynamic development lead to a drastic improvement in drag and e??ciency. Nev- ertheless, city cars and small/medium cargo vans are tipically known for their high level of practicality, linked to the characteristic square-back shape. As a consequence, this kind of blu bodies tend to develop big and complex three dimensional wakes and, therefore, a very high level of drag.