I hired the exact same type of car including colour last year, mine was done through Europcar. I requested a Commodore or Falcon but they ran out of those.
Overall driving from Sydney to Coomba Park (near Forster) and back, some city and suburban driving I averaged 7.8 lires/100km which is outstanding. This thing felt rock-solid on the highway too - felt I could do 160kmh all day easy if I had the chance.
I actually didnt really like it though, it was very cramped, the
HVAC controls and radio controls were way too convoluted to use - scrolling through menus and other rubbish.
I also didnt like the dash design, it was very upright and overpowering for such a small car. The back-seat was miniscule, think Corolla or smaller.
For me the front wheel drive - low boost turbo combo killed it for me. Torque off the line meant that the front wheels were always scrabbling or jittering around putting the power down whilst fighting with the traction control. Other NA 4 cylinder/FWD are fine, but this just didnt gel. I would hate to see how mega-torque diesel front-wheel-drives go like.