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Per this, the 3.91 rear is with the 6 speed manual trans with a 0.5 6th OD gear. Our 2009 6 speed does 1750 RPM at 72 MPH.. and pulls down 25 mpg. The low RPM is the reason for the mileage.

Yes, see the posted tech manual info; the PCM contains circuitry to be the 'external regulator'. This fellow is using a stand-alone external regulator.