I do have the Nav system.
Just to be sure I understand what you're asking, you're talking about having forward momentum, without having drive power supplied; a powerless coasting where the ICE is off and the EV system is not contributing to forward movement or eating away at it, the vehicle is simply moving forward in a coast.
If that's what you're talking about, then yes. Not only is it possible, but I do it all the time, much more often at night when I know the light patterns and there's little to no traffic. Other than the fuel used from about 20
MPH to 40ish
MPH when I accelerate to start out with, I use pretty much zero fuel after that for quite some time, where only wind resistance and friction slows the vehicle, slowly eating away at its speed. The energy flow display shows nothing, no arrows going in any direction and the ICE is off.