Andre,
The best route as far as I know north from Ushuia would be ruta 40 up until lago beunos aires, then cross to the carretera austral. From there you get the best routes. Also see the glaciers on the way up
Boat to antartica.... I have no idea sorry
Fuel... 200 KM!!!!! is that all.. you will need about 15 to 20 litres spare but only for 1 section...I forget the name of the leg but i think its 260 miles without fuel. That will be you only prob.
sorry to be brief. expansive connection!
simon
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