[aerohead]

Originally Posted by hat_man

From this article it's hard to imagine the TR7 having the same Cd as a 2018 Dodge Ram 1500.

https://www.inverse.com/article/6135...an%20object%20

Between Pininfarina in 1976, and Hucho et al., around 1978, Triumph would have had access to all the recently published aerodynamic 'detail optimization' research. Without altering the 'look' of the TR-7, it might have been straight forward, chiseling the drag down to Cd 0.36.
R.G.S.White, at MIRA, had published a 'recipe' for a Cd 0.245 automobile in 1969. Spirit of EcoModder-I is based on White's recipe, coming in at Cd 0.244 without mirrors.