Thought I'd post this, but with a bit of planning, you can fit two RTWs on one oneworld award.

SYD-HNL-LAX-MIA-YYZ-LHR-CPH-LHR-HKG-MEL-HKG-FCO-JFK-SFO-SYD

2 RTWs in J class for 220,000 miles - very good value IMHO! Thanks very much to the authors of the very useful previous posts on the oneworld awards which were very helpful to me when planning this.