You are right, I cannot generalize. In fact our main flush function in newer toilets is the same flow as almost all countries (Australia and Japan being the exceptions) but we also have far fewer "Duel Flush" toilets (apparently, I'm just learning this myself) and the low flow on duel flush toilets uses much less water.

Whenever I’m in the states and see the urinal “American Standard” 1 gpf (gallon per flush) I cry in Australian.

American Standard sells urinals with water use as low as 1/8 (0.125) gallons per flush.

https://www.americanstandard-us.com/urinals-list

(I only thought of this because the urinals at the companies I've worked at over the past decade proudly displayed these 1/8-gallon numbers.

.. and plenty of urinals are completely water free...

And they uniformly stink...

How much is the gpf or lpf in Australia?

In Australia, they're measured in pints