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@BringMeMyFix
That makes sense, doesn't it? If you're rolling along in the 25mph+ zone, you'll notice a bit of extra drag on 25s, and if you want to sprint, obviously they're not going to spin up as quickly (like the way deep section rims are sluggish to accelerate).
But just rolling along, there's less rolling resistance, due to the way the tyre deforms, physics of contact patch - wider tyre has shorter/wider contact patch, and it's the length of patch that effects rolling resistance.
It's all pretty academic really. I ride 25s at 80/85psi in the winter due to the comfort, and the extra bit of lateral grip on sketchy surfaces. And I'd use them in Paris-Roubaix type rides... if I had the talent to race, or the money/time to randonnée :)