Aerodynamic performance is critical for reducing fuel consumption and raising efficiency. Audi prototypes spend over 1,000 hours in a wind tunnel with improvements being made so drag can be reduced. Less air resistance also means improved handling, lower CO2 emissions and even improved safety. Improvements such as door mirrors which are aerodynamically shaped so rain is directed away from the side windows for better all-round visibility is another notable product of this extensive development process.
The Audi Q5 has a drag co-efficient of just 0.32.
Article source: www.audi.co.uk