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The answer to the original question actually varies from country to country and from brand of fuel. And it is not as simple is just the octane rating of the fuel. It is very complex and fuels may have detergents, ethanol and other additives that affect how it works in different motors.
I disagree that what is called high octane unleaded fuel is a waste oif money. In OZ, high octane unleaded (98 octane) is actually better in my 02 955 Tiger. The bike runs better - very subjective) but also gets better ecomony ans is actually cheaper per KM than cheaper unleaded fuel. This of course depends on the bike, the tune, the pipe and the rider.
Check it out for yourself and choose. Just don't use shell Optimax. At least in Oz, it is known to carbon up high compression motors (like Triumph motorcycles) if used a lot.
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