How much friction arise from the tires? Does anyone know how much friction (rolling resistance) arise from the tires? I know this heavily depends on type of tire, their air pressure and the type of surface. I would therefore like to see any source describing the friction on any combination of these factors. I am only interested in knowledge that can be verified.

The reason why I am interested is to understand what the maximum potential is if developing new types of tires.
How about the rolling resistance from terrymorse.com. Its the top link from a google search on "bicycle tyre rolling resistance".