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Simply disconnecting the injectors and spark plug from cylinders is not going to give you much of a gain. Your engine still has valves opening and closing, thus the 2 pistons not in use are still acting as an air pump, which is an inefficiency. Even if you remove the rocker arms and the valves stay closed, the 2 unused pistons are still moving up and down against vacuum. Think of it as the plunger in a syringe, when you plug up the opening, its difficult to move the plunger in any direction after a point. This added resistance transfers into a loss of power which requires more fuel in the other cylinders to compensate.
In order to reap the full benefits of this idea, not only will you need to remove the rocker arms on both the intake and exhaust, you'll have to disconnect and remove the rod from the crank and piston and remove the pistons as well. Then, the crank will need to be rebalanced.
A lot of work and costly for sure. I'd rather spend my time swapping in a more efficient 2 cyl engine (maybe even a small diesel), getting an adapter plate made for the transmission (if need be), try to lighten the car, and work on aeromods.
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