I just looked through this entire thread and was amazed to see that, despite all these opinions, no one cited any scientific studies on the rolling resistance of these tires. Are there none?

For my part, I tried to find studies but only came up with this one, "How much faster are supple tires?" But the article was published by an outfit that was selling its own tires, so would hardly qualify as a disinterested party.

Are we all condemned to opinions without facts on this question?...