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I agree with Frank that for the data showed to be meaningful it would have to be the same tire model in different diameters.
Rolling resistance in a tire comes mainly from deformation as it rolls, and to a lesser extend tread design.
It is also interesting to note that broken in tires can lead up to 7% fuel economy for big rigs vs new tires according to a cummins fuel economy paper I read. I find this figure to be extremely high, but it just goes to show that tread wear have an impact on tire rolling resistance.
Also, rolling resistance as a whole is roughly 82% tires, 12% bearings and 6% brake friction, so smaller tires start with a disadvantage as they spin faster for a given speed.
I'll post the sources later as the pdf files are on my other laptop.
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