I'm not a physics professor, but let me take a stab at it. I *think* (and I use that term loosly) what he wants is for you to take the table Yulor posted, and based on the real life CoF values for ice/ice and rubber/rubber, calculate the proper percentages for the table, instead of the real CoF values it has.

Since I'm not a physics professor, and since I dont know the CoF values for ice/ice or rubber/rubber, nor do i know if any of the values would even have a linear approximation over a % scale, I can't do this. Not that I even care what they are, or if they can be converted.

I *think* the only true way would be to use them to make a SWAG (Is steel on concreted more like rubber on rubber, or more like ice on ice?) and then adjust it based on how the engine reacts, which is what Fastlane alluded to in an earlier post.