ive got an 05 VZ V6 and get 11.5 -12.5 L/100km. thats regular traffic mostly 70-90km/hr from campbelltown to blacktown every day.
on a good run one way and driving economically by listening to the engine/gear changes I have managed 9.6L/100km, but this figure was too much effort to sustain daily,
I fill my tank once a week and get at least 500km every tank, sometimes around 600 if I get good traffic runs, I have found that 98 (BP Ultimate and Shell V-Power get me slightly more kms than 95 Octane Regular unleaded.
it also runs quieter and smoother, when I ran 95 octane I was getting a few coughs and splutters when giving it a squirt with the pedal.
If I push it all the time I'm around 13.5L/100km but still get around the 500km mark per tank.
I would imagine that the newer engine with SIDI would run even better than this on runs like I do.
I found that red lights and the stop start kills fuel economy by my trip computer, and unfortunately its the one thing I cant really change, although outside peak times I get better runs of green lights, but that means going to work early! #### that! I'll pay the extra in fuel! lol.
hope this helps somewhat (tho I know I'm not a VE V6)
Oh yeah, took a couple of weeks of this driving until the computer changed to my driving, the day it changed it felt like I was driving a different car, everything was smoother and she was well behaved and responded when i wanted it to, rather than blipping random gear changes like an indonesian school teacher! (previous owner, not meant to b racist)