the f650 can run on dingo piss...
using the North american fuel rating system, you can run on 87, 89, 91 or 94 (chevron), my 07 dakar usually gets fed the cheapest swill I can find, if the computer management is running fine, the bike can compensate for the lower octane by adjusting the spark advance.
Higher octane translates into the fuel exploding faster, meaning for really high revs you can utilize it, but on a thumper? Riding the poor girl over 6000 for long periods is just cruel...
Fuel milage and feeling for my dakar (with 77,000 on it) fully loaded, refill at 15 litres
87 octane -usually about 240mile/tank, feels normal
89 octane -usually about 220mile/tank, slightly quicker acceleration?
91 octane -usually about 200mile/tank, definitely crisper at throttle, but on a 600lbs load bike, its a matter of inches, not miles.
You should feel safe putting in the best you can find. If you do get into a lot of leaded fuel, and you are running OEM exhaust, this is a perfect excuse to finally bash that cat ceramic out, or else get a single sided (proper) can on that bike...
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