Originally Posted by aclinjury

Right, that's what i said, tire pressures play a role.

Furthermore, the graph assumes a STEADY STATE rolling resistance, which is usually not the case unless it is a TT indoor.
If you do many multiple hard out-of-the-saddle accelerations, or in a steep (7%+) climb, where torque on the tire is not constant, then you also have to consider hysteresis loss of the tire on lower pressure vs that on higher pressure.
You can't just simply say "wider tires" roll better and ignore everything else, because road surface and rider's style should also be considered in tire preference.

Another problem with 32mm or wider tires is that most are usually not made with "speed" as the main performance factor, most are made with durability as a factor too. I would be very surprised if any 32mm+ tire would actually outperform a 25mm one on a typical road, even roads with many cracks on them.