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I don't think it's downforce in all cases, the Koenigsegg CCX doesn't have much downforce, and neither does the McLaren F1 I think, though they don't hit 250mph.
The particular cars you listed have a lot of cooling drag thanks to the giant turbo motors.
Also keep in mind, fat tires. A 911 turbo S has Cd 0.31 claimed, even though it has only a tiny spoiler and an otherwise well-streamlined body, but it has huge 305 tires.
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