Indeed, but it depends a bit on whether you feel the 2 car households should be grouped in with the 1 car households or the 3 car households.
For completeness, one also has to ask whether or why we measure or comment using the statistical concept of households or persons.
Using WA as an example, ~34% of households had 2 cars. We can say that ~56% of households responded that they had access to 2+ cars. We can also say that almost ~75% of households responded that they had with 2 or fewer cars.
However, if we want to come up with an idea of a "representative australia" (an arguably increasingly erroneous concept by the day), we have to realise that the distribution of "people" amongst households will not be uniform.
Indeed, there is likely a strong correlation between the number of people in a household and the number of cars in a household.
What this means is that although only 56% of "households" reported having 2+ cars, the number of "persons" who experience life in such a household is not proportionate to the number of households reporting each characteristic in the population.
Indeed, given that one stat is likely correlated with singles, students and dinks, and the later is likely correlated with early and extended families, you would likely find that on a population weighted basis, the 2-3 car households may need to be counted as some multiple of the single/no car households.