Cd 0.23
"
Between 1953 and 1955, Alfa Romeo and design house Bertone created a trio of aerodynamic design concepts dubbed Berlinetta Aerodinamica Tecnica or B.A.T.
The B.A.T. cars were an exploration of aerodynamic ideas in the post World War 2 era as the jet age was just beginning. With the goal of achieving the lowest possible drag coefficient, they got as low as 0.19 and managed speeds up to 125 mph from only 90 horsepower.""
Cd 0.19
We are stille way behind. All that knowledge has been forgotten with cheap oil.