Interesting that you should raise the issue of tire pressure, Ashley64. I was chatting with one of the lads in a local bikeshop (Lethbridge AB) about finding a longer seat post with a built in shock absorber, as I had to swap the one that came with the bike for a longer (but non-absorbing) one. He asked what pressure I was running in the tires. "24 psi", I replied, and he raised his eyebrows. Typically, fat tires run at 5-6 psi, he told me...better for both comfort and traction. I was a bit surprised, so I did a little research, and it seems that fat tire bikes ride and race at around 5 psi, but are most efficient on pavement at 23-25 psi. I suggest a little online research to determine what might be best for your conditions. I've dropped my tire pressure to about 12 psi to see what happens. Perhaps @Voltbike will weigh in on this. I'll look forward to hearing of your experiences.
I've pumped mine to 20 psi but not had a chance to ride yet. Anything below this seems far too low for road use.