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Originally Posted by RandyO
I have never noticed any difference or documented any consistently better fuel economy with higher octane. I run the cheapest I can get, anything more than what suzuki recommends is a waste of money
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This is consistent with the theory. Engines have to be adjusted to get any advantage from higher octane fuel - and they then cannot run on lower octane stuff. Still, i'll give it a go and see what i think. It may be due to other additives they put in more expensive fuels rather than the octane rating.