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@Fox
Well, it seems not Ed. I've been reading up, excellent article here by the guy who measures the rolling resistance of tyres on biketechreview.com
Tires and wheels for timed cycling events
The bit on tyre rolling resistance is interesting. The Coefficient of Rolling Resistance (CRR) data at the end are out of date, but I've just had a look at the 2010 data. Here are some examples (lower is better):
.00384 Conti GP4000 Black Chilli
.00371 Conti GP 4 seasons
.00360 Fortezza Tricomp
.00334 Maxxis Hors Catagorie
.00313 GP4000S
.00250 Vittoria Open Corsa Evo 320tpi CX
So although the Fortezza Tricomp beats the 4 seasons, there isn't much in it.
The data suggest that higher tpi equals lower rolling resistance and higher psi equals lower rolling resistance, which is good for the Tricomps because they go up to 160psi. Of course 160psi might not be comfy on rough roads, but apparently the Tricomps are still comfy even at higher than normal pressure.
Although however hard you pump up a Tricomp, I don't think you're going to get it down to a CRR of .00250
They are pricey though! And light, so puncture protection could be an issue.
My brain hurts.