Australia has been metric
Note that Metric system is technically not SI. Metric simply means a coherent system of measurement that is a derivation of SI
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OZ uses all sorts of non SI units.
Note there are derived SI units and then there are the true "base" SI units of which there are only 7.
Such as:
Celsius - it's actually not the SI for temperature technically a derived SI but falls under metric.
Tyres and wheels - you would know about this one and is possibly the worst combination of SI and non SI units
Everyone uses days, hours and minutes - these are strictly non SI and non metric. Time in SI units is measured in seconds.
So the km/hr is non SI and non metric
Tonne as in metric ton (1000kg) is actually non SI but metric
Realestate still use hectare which is 10,000 sqm or but is actually not SI and arguably metric but very few people know its relationship to the metre
And everyone uses calories which is not SI or metric. The derived SI unit for work is Joule. But actually the SI base unit for Joule is the same as torque - see below
While the derived SI units for Torque is the Nm, to be really technical (aka OCD) the actual SI base unit is m2.kg.s-2
The reason joule and torque has the same units is because both are a measurement of work.