My bike really struggled with low octane 'Corriente' fuel in Bolivia, Peru and Colombia (R1100GS with a John Gemi chip) A modern bike might be able to cope (maybe mine would have with the BMW chip in the ECU) but on corriente it pinked like hell and conked out a couple of times when the engine got really hot. This did not happen using 'Extra' which is a higher octane.
Extra is generally easier to get near large towns. I don't think any fuel there has lead in it so your cat should be fine.
I would definitely carry a fuel bladder and use iOverlander to try to plan for fuel stops - we got pretty lucky with fuel in Bolivia late last year/earlier this year (a perennial pain in the arse) but others have struggled. Never leave a town with fuel without filling up!
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