I'm just learning how to use the navigation in my 2014 TE, and today I set up all of the destination locations that I have on my Garmin GPS. I created a couple routes and it came up identical in mileage and time on the four multi-point trips that I created.
I don't know who makes the Toyota navigation, could it be a Garmin unit? I was a little worried about the Toyota system, and plan on running both at least at the beginning of my next cross country trip, hopefully I can get to the point where my GPS will be put in the console and used as an emergency backup.