Quote:
Originally Posted by mollydog
Frank,
Your BMW is fuel injected, which means the knock sensors connected to the bike's ECM (computer) can tell the octane of the fuel you are using and make timing adjustments to suit the octane of the fuel.<snip>
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Incorrect - the 650GS doesn't have knock sensors, can't adjust to suit the octane. The 650 engine management system is much simpler than on the twins.
Except for gas in Brazil (high alcohol content), there's no problem with the gas in South America. Buy whenever you can from the major brands, fill often, not when you are nearly out and the only gas around is from the barrel on the side the shed.
As to the octane ratings, they are calculated different in SA than in the US - same system as Euro zone I believe. Here in Argentina now, the octane ratings are 95 for super, 97 for highest, and 91 I believe is lowest octane.
When you are in the Andes of Peru and Bolivia, you'll have a hard time finding anything other than the lowest octane fuel - which is just fine at high altitude.
There are a couple spots you need to carry extra liters, but they are few (Atacama desert I believe, Salar de Uyuni if you do the distance between Uyuni and San Pedro de Atacama, Chile, possibly a spot along Ruta 40 in Patagonia.)
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quastdog
Chiang Mai, Thailand
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