No such thing as "exact weight". It depends on how it's measured (1/2 tank fuel, etc) and what options the specific car has. US models weigh more due to the heavy bumpers. Perhaps in AU the average 120Y is less than 20% heavier than the average 1200.
The figure that matters for your question is the one dattodude mentioned: Quote:
you have to go off the weight that the RTA published for your car
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