Approximately 15% is what I've gotten although there is a big spread. This is consistent the comparison of the Michelin latex 22/23 with the Schwalbe butyl (105 grams) from the second jpg above. There are some comparative tests at the end of the list showing ~ 10% greater Crr for both the Bontrager RXXXL (53 grams) and RXL (65 grams) butyl tube and ~ 20% for the Bontrager standard (98 grams) butyl tube.

is this the Podium, but referred to as the GP TT? http://www.bicyclerollingresistance.com/...l-grand-prix-tt-2016

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wovebike.com | Wove on instagram

Great question, by the looks of it based on the description it is the same tire in different widths vs. the Podium TT. Also, the price looks a little lower.

I've never used the GP TT but have used several of the Podium TTs; the tread is very thin compared to a tubular 4000s which I now run on my race day tubs.

Holy 5-year old thread revival Batman.

How does the Podium TT compare to the Continental Competition? The latter seems to get more attention.

It appears the Podium TT has slightly higher rolling resistance compared to the Competition (0.0060 vs 0.0059), according to Germany's Tour Magazine: https://www.velonews.com/...ing-resistance_12493