That's a very interesting article. I've been skeptical about their testing methodology, but the results with the Marathon tires are definitely showing something. It looks like the 700x32 they got may have been an outlier in terms of manufacturing. The thicker sidewall (thicker than the 700x37 they tested) would go a long way toward explaining why it didn't perform as well as the wider Marathons. I wish they'd ask Schwalbe for another 700x32 to test with.

There has been a lot of discussion recently, largely spurred by Jan Heine's findings, about wider tires being faster, but if you actually dig into what he's saying you find that he's specifically talking about supple tires and he says the effect goes away and even reverses for tires with stiff sidewalls. The BRR tests are exactly the sort that Heine seems to think are missing an important part of the picture, but the results here are consistent with what I would have expected based on Heine's explanation of the wide tire effect.