Branko D

When over-inflated, yes. This is a sort of apples to oranges comparison.

A larger tire at the same pressure is a harder spring. Just try riding a 40mm tire at 80 psi; it's going to be a total boneshaker. A 23mm tire at 80 psi is going to offer a hell of a lot of cushioning (unless you are fat, in which case it will pinch flat and you should ride fatter tires).

We know overinflated tires have the least rolling resistance on a smooth drum test, but in reality on the road it doesn't quite pan out. When the tires are inflated so that they offer a similar amount of suspension, the rolling resistance evens out. What's left is tire aerodynamics, which doesn't matter that much in the pack but you're not going to see triathletes or timetrialists on 28 or 32mm rubber; 23/25 F/R mix is the norm.

If tire width was such a rolling resistance win, you wouldn't expect Continental to make their GP5000 more narrow than GP4000s at the same nominal width