Bugatti Veyron Cd 0.41 normal 0.36 lowered and preventing rear spoiler from deploying
Bugatti Veyron - Wikipedia, the free encyclopedia
Hennessey Venom GT 0.43 rear wing raised, 0.36 rear wing down
First Look at the New Hennessey Venom GT - Photos and Just-Released Details - Road & Track
Koenigsegg One:1 0.45-0.50
Koenigsegg One:1
They don't make THAT much downforce. At least not compared to all out racecars.
Are high Cd figures from cooling drag?