No one has mentioned a Commodore or Falcon wagon. Plenty of space, reliable, easy to maintain. Rear wheel drive, no CV joint issues etc. Parts are plentiful and cheap.
Mine's done 330,000 km and is still very reliable, I'd certainly be looking at these as an option.
I'd expect 10.5 km/l on the open road and 7.5 km/l around town. My 2003 VY Commodore 3.8l sedan does those numbers easily, I often see 12 km/l on the open road and rarely see less than 8.5 km/l around town. YMMV
The newer 3.6l engines are even better.
Without starting a Holden vs Ford battle, you couldn't pay me to own either. Particularly in that price bracket.