I'm using a 1:250,000 scale map and will have my Garmin with me too. It looks as if I'll cross over near Hogsater/Vestmarka.
I've been to Roros before, I met a group of women bikers from Oslo up there in September 2008, they were a great crowd. It was market day and I was shopping for thermals of all things, ha ha.
I usually have a range of 140 miles to reserve and will be carrying another 5 litres. This should give me a range of over 200 miles even off road so hopefully I won't be walking.
Sorry for the thread hijack