Fat bikes barely leave a track... I run the tyres on the Pug at about 8 psi for deep snow.
Mtb tyres usually get run at 35-40 psi to give as much contact and cush as possible, on roads with studded tyres you can run max psi to get the best speed if you don't mind giving up some ride quality.
Tubeless tyres can be rolled out at lower pressures.
Last edited by Sixty Fiver; 12-03-13 at 01:36 AM.