Plenty of gas if you've got a 300 mile/500 km range. That means carrying a 5 liter gas can with most overland bikes. If your range is shorter, you need to plan carefully, including asking other travelers about availability, since gas stations are sometimes closed or out of petrol. And don't forget to allow for using 25% more gas due to head and sidewinds.
My KLR has a 22 liter tank. I used my extra can a couple of times, although this was because I skipped filling up at every opportunity. On occasion I cut it pretty close, mostly because it's difficult to account for the wind effects, and I've got no gas guage--only mileage to indicate when to fill up.
Hope that helps.
Mark
(PS: no idea what "Patagonian high route" means)
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