Lived in Minot, ND for 3 years. Never once had a problem with GAS freezing. I also drove the truck everyday. So, condensation in the tank wasn't an issue either. If anything, its diesel that you need to watch. But even then, i think many of the norther areas use a "winter blend" fuel that has anti-freeze/anti-gel additives.
'04 Rubicon aka "Mutt"