This may have been posted before, but I hadn't seen it. This is a study done on tubulars and clinchers to measure the rolling resistance in terms of watts required. There is a brief discussion (complete with neat Chrysler graphics :-) on the trade-offs among rolling resistance, comfort, puncture resistance, aerodynamics, etc. The fastest clinchers had lower RR than the fastest tubulars; the fastest tubular measured took about 34W, while the fastest three clinchers were all under 30W. The Tufo Elite Jet was an astounding 50-52W, depending on air pressure.
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"Go yell at an M&M"
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"Go yell at an M&M"