Originally Posted by odano
I don't disagree with your logic, but it's also about rolling resistance. The Ritchie Tom Slicks 700x30 I had were rated 80psi max. The Conti UltraGators I now have 700x28 are 120psi and I do prefer the slightly narrower tire in my SKS P35 fenders.
PSI is important. My 32's run at 95 psi. Also, they easily fit under my SKS P45 fenders. I need the P45's because I sometimes use Nokkian 35 studded tires which, alas, run only at 65 psi.