My bets on cylinder deactivation, and dammit, I'd bet my left nut that even a full size truck could get ~35mpg at 55mph w/ the Phil Knox aero treatment, LRR tires, and some way to manually actuate the cylinder deactivation doohickey.
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My 2008 Chevy Tahoe has the Eaton Active Fuel Management system (internally called "Displacement on Demand"). After 24k miles, and using the ecm provided instant fuel economy, I can see the change from 18 to 26 mpg on a flat road at 55 mph very day, both directions. This includes trailer towing(boat and hay delivery).
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