The dash display may or may not be accurate. My '16 Versa is always 4-7 MPG optimistic. Lots of my driving consists of secondary roads with high deer population so most of my driving is c/c set at 40-45 MPH. Here's the link to my fuel log since purchase in Feb. 2019. All figures are hand calculated.
https://www.ecomodder.com/forum/em-f...ehicleid=10493
The only complaint I have with my Versa is the reliability issues Nissan has had with their CVT's over the past 20 or so years and considerable road noise.