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I'm sorry to confuse your words with the OP, I can see where it might help with low rpm, high load. I get the feeling that is not the case with the Hyundai in question.
My brother has a low mileage 2003 Mazda 3 that has started having MPG issues along with off and on codes. It seemed like it was running perfect but it sometimes started sucking gas even as much as twice normal. We replaced the mass air sensor and the front O2 but sometimes it still throws the light for a slow fuel/air response and then mileage drops (not as bad as before). We had to weld a new O2 bung on the manifold and I think it might have moved the sensor out of the exhaust stream too much. He bought a OBD2 bluetooth adaptor and just immediately clears the code and then it goes back to good MPG. I figure it's going into an open loop condition but it doesn't show up on the O2 data logging. Little stuff like this can make a big difference.
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