Hi. I rode on the new liquid cooled R1200GS in Uzbekistan, and all Central Asia. The R1200 has something called Octane sensor. This means (as far I understood it) that the engine power is automatically derated as the fuel has a lower octane.
The R1200GS will work just fine, don't worry. Just filter the fuel with something suitable (like women stockings) before you put it in the tank if you buy from road side bottles.
Just tell your friends not to be harsh on the throttle as the engine will click a lot under bursts of power.
On the good news, with the 20L tank you can get as much as 540km range on the 80 Octane fuel!
Fuel availability is an issue but if you ask around in towns and villages you will find some.
Have good trip.
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