Hi,
I have now had the following Commodores:
VL 3.0 Manual
VS II 3.8 Manual
VY II 3.8 Manual
VE MY09 SV6 Manual
Over the models, the weight has increased from 1250 to 1725 Kg, or about 38%. Power has increased from 114 KW to 195 KW, or about 71%. Torque has increased from 247 NM to 340, or about 38%. I do not have drag coefficient and frontal area to calculate any changes in aerodynamic drag.
It is an indication of improvemnents that economy has been roughly the same for each model even though weight has increased markedly. My VE is not quite as economical as the VS II and VY II, which were lineball. I averaged about 9.5L/100Km around town in the VS II and VY II, and get about 10.0L/100Km from the VE. On the highway, it was around 7.4-7.8L/100Km for the Ecotech cars and about 7.8-8.2L/100Km for the Alloytech.
With all of them, I have been able to get from QLD to Sydney on one tank routinely, i.e. 850 Km. Around town, I fill up weekly, so do not have a clearly km/tank figure, though I would assume about 600.
At first, I was a little disappointed with the VE 3.6 in comparison to the Ecotech. However, now it has been run in, the difference is chalk and cheese. I much prefer the 3.6.