Join Date: Mar 2013
Location: Ontario, Canada
AWD setups are more efficient than part time systems, like the 4WD trucks mentioned. This means they have less drag, better fuel economy and were designed for continuous use rather than intermittent use.
AWD is superior in almost every way to FWD or RWD, especially off-road with reduced traction - aside from added weight - and are the hallmark of performance Subaru cars [rally heritage].
Why might you be seeking to disable it?
Laszlo - blue '04 WRX
The WRX just told me to drive faster, lap after lap.