Quote Originally Posted by Marlin View Post
I would think there would be a small gain in mpg, but not a significant amount. It takes so many joules of energy to move your car "X" distance, whether that is via the rear wheels, or the front wheels is irrelevant. It is the conservation of energy. Disengaging the front wheels does not reduce the amount of energy required to move your vehicle, but I would say the amount of wear and tear on CVs and whatnot would make them well worth it.
In the VX the there is no 2WD setting for the transfer case, therefore the front drivetrain is going to be turning all the time, whether the hubs are locked or not. I doubt there is going to be any savings in mpg or wear and tear in this scenario.