[aerohead]

I see a scale-model tunnel at Nissan.They cannot measure full-scale detail.
The Mercedes tunnel looks familiar.The FKFS is next door to them and they've been using the tunnel there,which Kamm used in the 1930s.
Anyone with Hucho's more recent books might have something on newer,climatic/accoustic tunnels.
Cd 0.26 is not quite 'low-drag,' which 'begins' at Cd 0.25.MIRA and Pininfarina said that any 1978 car could have been made with Cd 0.25 without dramatically altering the styling.
Cd 0.26 is not Cd 0.10,so there's still some fruit on the tree.
Cd 0.26 IS pretty good for a sports car.Sports cars are to stick 'fast' to the roadway.Low drag isn't necessarily driving their design.