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I can't offer anything more than an anecdote, but when I tried the belly pan on my car, I was sure I noticed a decrease in road noise. Debatable how much was from the sound insulation properties vs. improved aerodynamics (better aero = less wind noise).
And about that 40 lbs: If I could easily take out 40 lbs from any of my vehicles without affecting my own criteria for keeping it practical, I sure would.
Perhaps surprising, but PaleMelanesian has documented a small but measurable benefit of driving with a nearly empty fuel tank vs. a full one from his vast collection of commuting data. That's in the range of ~40 lbs.
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