Wow. 34K in a -25 celsius**********? Daaaaang.
Only thing I know about fat tire bikes is they're freaking expensive and it seems like the mountain bike people are the people who are all over them. I caught a news segment showing them riding them on off road trails and also trails that are groomed but snowy out west. I wouldn't mind trying one but I'm not going to buy one. Don't have that kind of extra money.
Whatever works.... the discussion at least gives a lot of good ideas.