Hi Gary,
I also have na 09 limited that I got on 7/31 with NAV. If fuel cut is working when going over 40 MPH, shouldn't the tach go to zero? When I take my foot off the pedal the tach just goes to 1k. If I'm under 40 it will go into ev. I don't have a scanguage yet, but the instant mileage readout bar goes to the top of the graph.