I do know that tire design has a far greater impact than surface texture does on most racetracks.
Example, 3360lb car goes down the dragstrip on steel radials, nets 118mph. Switch tires to bias ply DOT racing tires, and trap speed goes to 116mph. In this performance envelope, each MPH is about 10rwhp on a dyno, so 20 rwhp additional power was consumed.
The formula in the first post yields "10". Even if it were kw, it's still less than the extra loss going from steel to fabric, and soft to medium compounds. Tire pressure was the same, 20 PSI.