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With a viscous coupled AWD or similar system, most of the time the AWD isn't doing much. It's only when there's wheelspin at either end that the VC (or electronic equivalent) locks and you get torque transferred.
So I'd say in normal driving the difference between having the rear end switched in or out will be minimal.
Physically removing the AWD parts will show the most gains. I did this on my little Nissan and there was more usable power and mpg, but to be honest nothing startling.
Landrover Freelander owners here in the UK do this too and call it 'mondo mode'.
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