Originally Posted by Viich

BicycleRollingResistance.com results seem to indicate that wider is better as far as rolling resistance at the same pressure, that at the 15% drop value narrower was slightly better, and it was exactly the same if he adjusted for the same 'comfort' (4.5mm drop for each)

This was his GP5000 comparison: Continental Grand Prix 5000 Comparison: 23, 25, 28, and 32 mm Compared Published: 2019-02-19 by Jarno Bierman

I pasted in the first table, the raw psi numbers:



Rolling Resistance with Michelin Latex Inner Tube
Tire GP 5000 GP 5000 GP 5000 GP 5000
Tire size 23-622 25-622 28-622 32-622
Tube Latex 80g Latex 80g Latex 80g Latex 80g
120 psi 8.5 Watts 8.4 Watts 8.0 Watts 7.8 Watts
100 psi 8.9 Watts 8.9 Watts 8.4 Watts 8.2 Watts
80 psi 10.2 Watts 10.0 Watts 9.2 Watts 9.0 Watts
60 psi 12.3 Watts 11.8 Watts 10.9 Watts 10.3 Watts