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Sounds like a cool idea, but also quite involved.
My wife's '09 Impala SS has GM's 5.3L with cylinder deactivation and it does seem to work nicely on the highway. We averaged 29 mpg on a recent 1100-mile round trip. That was with two adults (and I weigh 240), 150 lbs of kids and the trunk loaded full-to-bursting with coolers and luggage going 75-80 mph the whole way (speed limit is 75).
That said, I'd be willing to bet that you'd be better off just changing out the rear gears to something taller. It would have a similar effect...reducing the number of cylinder fires per mile.
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