No idea but i guess between 60 and 70. IMHO 90 is a minimum. I usually play games on the PC with the FoV at 110 - 120 depending of game. But then again i'm an oldschool Quake player so i grew up with high FoV settings. Some like low FoV settings and some like them high. Also the giant weapon models dont help the fact that the FoV is low and you can see even less. I have a theory of why the FoV usually is so low on consoles and that is that the higher FoV the more is shown on the screen from the world. That means that the console has to render more graphics and therefor impact performance. Just a theory as i said.