You need to go to Europe to see the little cars then.
Australia has half price petrol to Europe and you see this in both car size and engine size.
Also I have read (newspaper so who knows) that Australia allows far more fuel inefficient cars than Europe.
https://www.abc.net.au/news/2019-10-11/australians-car-not-a...
But equally we have a lower percentage of diesel cars which is great for not dying
https://www.sciencedaily.com/releases/2017/09/170918093337.h...