Since I acquired my FWD Murano 2 days ago, the Fuel Economy display has varied between 14.2 and 14.7 MPG at the absolute highest. Do I need to return to my Nissan dealer and have them fix the control unit, or is the car actually getting that kind of mileage? FWIW, most of what I have been doing is local and US highway driving, with just a little Interstate thrown in. And I have been very gentle on the accelerator with only one or two brief exceptions. Based on the amount of gas I have twice put in the vehicle (89 octane) and the position of the fuel guage, I am almost apt to believe that number. I didn't expect 25 highway, but what happened to 20 city?