No, the US in general doesn't have more high performance cars. Typically, our higher end sports sedans (mustangs, etc. ) are underpowered compared to foreign models. This is due to the US having very strict emissions requirements. Other countries (such as Australia) dont have requirements quite as tough as ours, and thus can run dirtier cars. With that increase in pollution come a very nice increase in power. But to get that power, the cars REQUIRE a "high performance" gasoline. Your engines typically have a higher compression ration for better performance. They can do this through different engine parts, or forced induction. To keep the gas from igniting early under these conditions, higher grade gas is used. If higher compression engines are more standard in Aust. than in the US, it would make sense for higher grade gas to also be standard.
I have never lived in Australia, so im not positive, just speaking from what i've noticed.
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