The main roads in Patagonia are almost all asphalt now so the wind will be easier to deal with. I encountered the highest winds near and around Tres Lagos. We were coming from Gobernador Gregores on the longer dirt route (not the 40) and I saw a rider get blown off the road by the wind. Riding in the dirt in those winds can be tricky, you'll want to let your rear tire break loose and allow the bike to list as you gain speed. Not too tricky if you have dirt riding experience. I was there in early 2011 and the 40 was getting fresh asphalt from Bariloche all the way south to Chile, I rode a lot of miles in the dirt next to the new road that had yet to be opened.