Comparing the weights of my Michelin Pilot Sport tires (440gr ea) and my Marathon Greenguard (730gr ea), the difference is 290gr ea which, considering the weight of my 29er, rear rack and somewhat loaded panniers and me, doesn't make much difference (~0.5%). That is the simple consideration of the weight difference. However, given that the tires need to be spun up to speed, is there physics involved that is more complex to suggest that the difference in weight is multiplied because it is spinning and not just simply a static difference like adding more water to your water bottle?