I don't really care how fast they are, but I generally run closer to 90 PSI. I've been running 60 all winter in the Nokians so I'll survive at 75. After all, 40% of my ride is on gravel so it hardly matters if I have the fastest tire around. I've never run slicks and probably won't, given that I'm on gravel with a clay binder that gets kind of slippery in the rain.

I'm FAR more interested in durability than speed. The speed question was just curiosity since the PSI rating is lower than I'm used to.