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I feel that realistically fuel economy with a v8 would probably be the same as the 2.2 simply due to the extra 3.5 liters of combustion chamber needed to fill with fuel/air.
That being said I had an auto 4.3 v6 4x4 truck and an auto 5.3 v8 4x4 truck that both got the same mileage
I suppose an economy tuned or flashed ecu could net some gains.
The 5.7 probably makes the same power at 2000 rpm as a 2.2 at 5000 so with tall gears in the rear you may see improvement.
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