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If you change anything about the cams, you'll need to have it re-tuned - which could buy you some fuel economy on its own. Most factory tunes prioritize emissions, and leave a bit of economy on the table. Re-tuning may not be possible on the stock ECU, in which case you'd be looking at $1500 minimum in electronics, plus the cost of the tune - and most tuners won't touch part throttle tuning because it's time consuming and difficult.
Typically, a "cooler" cam will, in fact, slightly help economy, and may also improve torque at the bottom of the rev range, by reducing it up top. A cam wouldn't be the first place I'd look though.
Instead, I'd consider the following "engine" mods:
-Block heater
-Balance shaft delete (if it has them)
-Electric power steering conversion (or manual rack)
-A tune
-Possibly a slight underdrive pulley for the accessories
What would probably help even more is taller gearing - a slightly taller top gear can save a ton of fuel on the open road.
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