It's a very close call then lol. But to think Vauxhall got it right in 1987 when the Calibra was first designed and wasn't touched until this was designed lol, even with the supercars that came out in that time. But, Cd is based on the areo dynamics of the front of the car, not the whole thing and this is the record that Calibra still hiold today. Drag, downforce/lift, lift balance, handling characteristics, cooling, visibility - dirt, water flow management across windows etc., noise levels, etc are all things considered in the "areo dynamics" of a car.