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I think deactivation will be a tough sell in a 4 cylinder engine, taller tires or lower overall gearing is a better tactic. On vehicles with hugely oversized engines, cylinder deactivation will be more significant efficiency wise (which is indicitave of their poor design). Not interested in arguments but you are still accelerating and decelerating the mass of the piston and a portion of the con rod, on the dead cylinder ('s). While an "air spring" may reduce that loss, I'm more inclined to think that adds work and inertia may even overpower compression as far as loss percentages.
regards
Mech
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