25mm tyres

yet on page one there is some crap about pushing air away from spokes. If you push air away from spokes, what takes it's place? A vacuum? Water? Celestial Ether?

That was me. totally based on 'something I read on the interweb'. I remember reading that going from say 23mm to 20 mm was actually a bad thing aero dynamically speaking. For the same reason TT bikes have seat tubes that shield the rear wheel. I'm not going to pretend I truly understand it though, so I cant really defend it.

Wide tires only roll better at the same inflation pressure, but narrow tires can be inflated to higher pressures than wide tires.

This is exactly what Sheldon says.
Seems odd but comparisons of rolling resistance are often carried out at the same PSI, not the appropriate PSI for the tyres being tested WTF?.

was interested to note that higher quality tyres benefit least from being overinflated.

Its because better tyres have better flexual properties.

Had also forgotten that front tyre should be 10% lower than rear, was generally runnin them at 5psi lower

If your on smoothish road and run the same tyres front and rear. During winter I try and run my front lower still for better traction.

can't imagine having a rear tyre lower than 100 psi but I am a lump and have 23 tyres

Currently running my 42mm rear at 50 PSI, with about 45 PSI on the front. When the snow/ice comes I'll probably try to lower these slightly. I reckon these would roll real nice at this pressure if it was'nt for the mad tread/studds

I fully intend to run my 2,55" 29er tyres at less than 30 PSI (I'll have to try this out a bit though).