Is the following routing OK for a 22K circle pacific ticket:

YVR-NRT-SYD-JFK

This clocks in at 19,499 miles using Mileage Monkey. Two questions

1. Can I begin in Canada and end in the US?
2. How will the mileage SYD-JFK be calculated? This is a Qantas one-stop in LAX (single flight number) Will they use SYD-JFK or SYD-LAX-JFK?

The circle pacific fare out of Canada is a real deal right now, especially compared to a DONE4. In D class:

ex-us ex-ca
(USD) (CAD)

22K CP 8,370 7,290 (or $5,905 USD)
DONE4 8,190 9,090 (or $7,363 USD)

Strange that a 22k circle pacific costs more than the DONE4 in the US.