Submitted by fgaliegue on June 15, 2016
I cannot find that information anywhere and I'd like to know.
Many sources mention the S's drag coefficient which is arguably excellent for a sedan (0.24) although the new Audi A4 reportedly does even better (0.23). But the aerodynamic force resisting a car's advancement is a function of the drag coefficient _mutiplied_ by the frontal surface. And that data is missing.
A rough estimate would of course be to multiply the height by the width, but that is very crude and pessimistic. Is this information available somewhere?