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It's worth noting that there's only a tiny drop off if you fall off the peak island - you can go all the way to ~3750rpm with nearly the same efficiency. OEM's have already tuned our engines to be economical for the majority of real world driving.
An OBD gauge is unlikely to pick up improvements in economy at BSFC, it measures air, not fuel, and is never that accurate.
I had a pre OBD MY2000 Mercedes that had a definite dip in consumption as measured at the injectors at ~2800rpm (80km/h). My non OBD 2010 Proton will get my UT-Comp so we'll see I can pick up a similar drop again.
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