I was reading some old posts on the fuel types being purchased. I noticed that a number of X5 owners were even buying <90 octane fuel for their cars.

It got me thinking if octane levels vary from country to country. Here in Australia we have:

Standard ULP - 91/92 octane
Premium - 95 octane
Ultra Premium - 98 octane
Ultimate Premium (with 5% ethanol) - 100 octane

Is that different to the rest of the world?

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2004 BMW X5 4.4
2006 BMW 335i Coupe