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I specifically said it will make a difference in certain bicycle like a road race one running 25mm rubber;
Do bear in mind that the bike is a lightweight steel bike with clearance for 42mm tyres, seatpost make almost fuck all difference unless the bike is incredibly stiff with high pressure tyres.
Let me be clear, those split VCLS seatpost will make a difference in comfort, but on that Cycles in Motion 650b Randonneur, it make fuck all because it cannot be set high enough to take advantage of it, on top of the fact it's on lightweight 38mm tyres.
As for the pressure difference, I prefer losing a bit of pressure as this provide more grip on poorer road rather than having all the components to make up the difference and run a higher pressure on the tyres.
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edscoble
You're going up against Josh Poertner who probably knows more about tyre pressures than anyone. I know where my money is.