Most excellent Start at 28psi, that's what I run in my run flat tire.
Since you are a first time Darksider... be aware that you will feel a little lateral "drift" if you stop at an intersection, which the pavement sometimes has worn spots in it from heavy traffic. Not a big deal, keep a good grip on the handlebars if you encounter it. The car tire will try to find the bottom of the worn spot in the pavement. Not an issue if you are at speed, but when slowing to a stop you will sense it.
Other than that, you are going to love the handling, longevity, traction and being a member of a discipline that defies all and naysayers.