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What be better for mpg? 4 wheel drive or 2? The reason why I ask is because if u use 4 wheel ur not dragging a set of wheels. Just trying to figure what's best for mpg.
 

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4wd vs 2wd

Unless you have a limited slip differential in the xfer case you will be creating a binding in the front/rear in the transfer case. This is due to any difference in circumference of the tires and the front taking a longer path on any forward turn. That windup can actually rip the transfer case apart and can surely make it almost impossible to shift out of 4wd.

It is not advisable to use 4wd on any solid smooth surface. It isn't as critical on dirt/gravel roads as the wheels slip enough to keep the binding from building up.
 

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I always take the "if not 100% sure, ask others" route.
Good idea...

The front end on 4WD vehicles tends to be geared slightly faster so that the front can pull the rear end (from the weight of the engine giving more traction). Even if you are going perfectly straight the drivetrain will bind and can just destroy your transfercase.

That and the front end also travels a further distance in a turn than the rear end does. some argue that in a 360* circle the front travels 2x the distance as the rear.
 
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