I drove up as was planned last month 2/13-2/18 from Spokane. The road was "better" than the summer months. There was some slippery spots near Toad River(one hill was a go/no go and I went!). From Burwash Landing on the road was gravel in spots, but frozen and the truck "heaved and porpoised" a lot less than in the summer.
Gas was running around $3.75 a gallon, higher once you left Ft. Nelson until you hit Whitehorse. It higher now Im sure.