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While I don't have any reason to doubt that your MPG is up from before, I don't think the reason is that the ECM was fooled.
The Mass Airflow Sensor tracks the air mass passing by it - pressure, temperature, volume, and presumably humidity are already accounted for by it. The location of a restriction upstream or downstream from it should not affect the mass of air passing it by.
In the sense that you no longer have a wide open throttle, it does in a way simulate altitude.
However, Boyle's law will not be denied and the restriction will require extra energy to compress, accelerate, decompress, and decelerate the intake air around it.
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