I wasn't aware of this test before today, and I gotta say, looks very interesting!
The detailed fuel economy reports aren't up yet, but looking through previous results was an eye opener.
The tidbit I'm waiting for from the most recent test is the fuel economy comparison between the Ram 1500 diesel and Colorado diesel. While they were saddled with different trailer weights, the unladen and 1000lbs payload tests would be the same. I suspect that the Colorado would carry only a slight advantage but we'll have to see.
Of course, the winner here is really VM Motori, who produces both the diesel in the Ram and the GM trucks.