Tire pressure suggestions

[H0tsauce]

Every link that google gives me regarding tire pressure says "start with the tire pressure your manufacturer recommends in the owner's manual". My bike didn't come with an owner's manual, so I'm at a loss here. The pressure I've been using for the past year or so has worn the tire in a way that apparently means it's over-inflated. I don't actually know what that pressure was because I didn't install the tire, and I ran over a nail and the tire is now flat so I don't even have "less than that" as a starting point.

It's a 300lb bike and I'm around 185. My riding is mainly suburban and country roads with some highway. Can anyone suggest a decent pressure for street riding?

Thanks in advance!