This is very helpful. Sounds like doing the pass de jama both ways (RT) is a great idea, so beautiful you want to see it again. Taking the coastal road is twice as long. As for Ruta 40, the thought is we'd like to take it from the lakes region of Chile back up to Mendoza, I'm with you, living near Napa Valley, I see plenty of vineyards. I think you are saying that you can opt for paved ruta 40 on that stretch....wouldn't mind some more specifics. The other two riders have dirt bikes so they might want to venture on to unpaved versions of the 40 but I'd rather stay on paved.