[roflwaffle]

I can't find any info on the test load. Is it just the tire/wheel combo, loaded proportionally to the tire's load rating, or something else, what's the ratio of load?

Edit- NVM, standard load is 70% of the max.

I'd also be cautious about coming to any broad conclusions regarding Crr/tire size w/o excluding OEM tires and insuring all the tires were constructed via the same method. It could be that the more expensive version of the same name brand are using different compounds that lower Crr, and/or that the OEMs (they tend to shoot for lower Crr to help out w/ the EPA mileage testing) are moving things around a bit, not necessarily that larger tires in and of themselves have lower Crrs.