I do a fair number of “free group rides” in Seattle with the Cascade Bike Club. They’re great! An, I’m not one of the fast kids. So I’m in the back with other slow kids. Skills can be lacking amongst the crew at the back. 
I love the middle aged women just trying to get it figured out without wiping out 15 people rolling up to a traffic light. I’m grateful for the hesitation their evolving skills brings. The 22 year olds with an incredible “engine” but no sense for how it might work to get along with a bunch of other people on bikes. They scare me the most! Ha Ha! (ok. AND i’m a little jealous!
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The clip v clipless pedal moniker goes back decades . . . used to be pedals had a “cage” with a ridge at the back of the pedal. Cleats had a slot that slid over the ridge. Then you pulled the tension strap around the foot & cage to keep the foot locked into the pedal. “Clip pedals.” The first “clipless pedals” were (I think) made by the ski binding company Look. It was a revolution at the time to have pedals you could lock into without “clips” so, “clipless.”
And, I agree. Continuing to call them “clipless” is pretty ridiculous. I also think we should come up with a new name for the “horseless carriage.” I’ll give it some thought and make suggestions
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Check the data from Rolling Resistance website. It’s incredible but the 44mm Rene Herse are almost as fast as the Conti GP5000 32mm 
Rolling resistance is just one measurement. Weight and aerodynamics are another.
I don’t have the answer but my unpopular (?) opinion is that, no matter the efficiency, anything bigger than a 28 on a road bike looks silly.
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I thing the new Colnago c68 takes 35mm tyres, I certainly wouldn’t turn it down
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Do they adjust pressure to account for additional volume? Or just compare 40psi vs 40psi?
Picking the 44mm tyre would test awesome on a drum if at the same psi, but wouldn’t feel as awesome on the road at the same psi.
That’s just a fair-weather gravel bike.
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the weight difference is negligible in respect to the entire system. we’re talking a 0.2% weight increase.
Aero on the other hand isn’t so small, but still small when compared to the entire system.
Pressure is adjusted based on tire width.
30-32 = 33 psi/2.3 bar
33-35 = 30 psi/2.1 bar
36-38 = 27 psi/1.9 bar
39-42 = 25 psi/1.7 bar
they test them at different psi’s, above is the ‘Extra Low’ table. they also test them at Low, Medium, and High.
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Rolling resistance is a small part of the resistance of the entire system as well.
The entire system should still look like a road bike too. 
considering the only things that have an impact on rolling resistance is the tires and the bearings, tire choice is much higher in impacting the system in that regard.
If your bike has clearance for 44’s, 28’s are gonna look equally as stupid though.
Hot Take: a bike with clearance for 44mm tires, isn’t a ‘road bike’
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I was including all resistance. Like air resistance and drivetrain resistance.
I agree with that hot take whole heartedly.
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My unpoplular opinions:
Crit racing really requires no skill but comes down to who has the strongest sprint. They should just all line up on a 1/4 mi section of road and skip all the laps.
The last couple impossible route videos were extended therapy session for Tyler and not cycling videos at all.
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Optimized VO2Max interval is just bro science.
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The Tour de France is the Cape Epic for Roadies
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Not quite?
RH’s best tire that they reviewed from a rolling resistance only perspective is the 44 Snoqualmie Pass Extra Light - Rene Herse Snoqualmie Pass TC Extralight 44 Rolling Resistance Review.
Based on the public data, lowest measured rolling resistance is at 33 PSI and is 13.5w. That page then shows a graph of rolling resistance for GP5 TR and quotes it at as basically the same as these RH at “low pressure.”
…However, when you actually pull up the GP5 data for any of them, the rolling resistance at typical pressures is lower than that. I think the comparison on the RH page is when both the RH and GP tires are at 33 PSI, which maybe isn’t the best comparison.
As others have said though, and again like in my original comment, rolling resistance is only one part of the equation. You also need to incorporate things like aerodynamic drag.
RH makes really good/nice tires, and if you want to run 44’s for comfort, go for it.
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End masters national championships.
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WRONG. i need to just survive and ride as an 80 y/o so I can be national and world champ by being the last person standing
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Yer…I have often said that as long as I live long enough, one day I’ll be a national champ and / or qualify for Kona. 
#LastManStanding
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Or Nice
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