You just want to argue. FYI, yes, I did and I did a lot more. The year was 1988, I was part of a tri clinic that I was to give a show and tell at. At the time there was a big deal going on over sew ups vs the new high pressure clinchers and which was the better choice for the triathlete. I owned at the time four sets of MA40 on Mavic (501?) hubs and yes, I ran numerous tests over several days on the Rice University parking lot and two things became quickly apparent:

1. The biggest difference was tire pressure. I ran tests starting 20psi over max rated all the way down to nearly flat. The higher the pressure, the further I rolled. The biggest declines occurred after about 20% pressure reduction and downward. Wow, you mean properly inflated tires matter--yes, they do.

2. The smaller cross section tires did roll further. Wow, you mean a minimal contact patch equals lower rolling resistance, yes, duh.

Yes, I corrected each tire/wheel for diameter into the old Solar Cateye which allowed you to input the exact rolling distance allowing me to keep my speed, 10MPH, over the start line consistent.

I tested Specialized Turbo R in three sizes, Michelin Pro in three sizes, also ran some sew ups for the fun of it and no, the 28mm tires was a different brand because nobody make at the time a racing tire in that size. The two in that size I used were the smoothest, lightest, I could find.

I crossed the start line 10X with each set at exactly 10MPH stable for 25 yards before the start line on smooth, fresh asphalt and rolled until my the bike fell over and where my foot touched is where we called the end mark. The ten runs were measured and repeated in the other direction and then averaged. Temp was about 94 degrees and zero wind and yes I had a hang glider hand held wind meter.

Go ahead, argue some more. Tire pressure was the biggest factor followed by the tire cross section.

I was concerned that the 19mm tire would sink into the asphalt, and roll less distance, this proved not to be an issue. Also, the Vittoria 180 psi sew up rolled slightly further than the Turbo 23mm but not as far as the 19mm high pressure clincher. I attribute this to the sew up not being as smooth and true as the clinchers.