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subaru only egr's the driver side rear cylinder. I really dont know how much this matters, but I imagine that it can't help much. as for exhaust restriction, you can de-restrict if post cat and see what the effect is.
AWD- that car is spinning all the drivetrain all the time. When you pull the fuse, you are only deactivating the center differential. All this does is take away input torque to the rear, you are still dragging the rear drivetrain down the road.
To maximize your efficiency, try to see if the drivetrain has the half shafts at level when the car is sitting on the ground. If not, lower or raise the car to do so. This will increase the efficiency of the drivetrain.
Just some ideas.
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