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Again, systems vary.
Merker, you could swap your transfer case for an NP231, run in 2WD, and not see any improvement. I've done it on a number of Grand Cherokee's. You could pull the front driveshaft and still, no change. The front tires will still turn the front diff because your front hubs are always locked. That's the primary added drag of the system.
On the other hand, a true 2WD Grand Cherokee without a front diff will get a couple MPH better on average. Depends on driver, conditions, engine condition, etc. Those are the largest contributions to MPH differences between two otherwise similar vehicles.
To provide a good answer for the original post we need the vehicle model, year, and 4x4 system name. Anything else is presuming across systems that can be very different.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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