My 2014 distance to empty is similar to yours - it's all over the place. The broad range may have something to do with the mpg from the previous tank full, how much fuel I most recently pumped into the tank, or space aliens.
I once drove our Sienna a little over 100 miles after the distance to empty showed zero miles and there were still a couple of gallons left in the tank when I filled up. That occasion resulted in some screaming from my wife who was certain that we would run out of fuel. I've driven 50 to 75 miles a number of times after the distance to empty showed zero. It irritates my wife but I tell that I'm helping her build up her resistance to stress! I've stopped draining the tank down like that as much during the past couple of years due to the increased number of lane closures, traffic jams and detours on our frequently traveled routes.
I've noticed similar complaints about distance to empty inaccuracy on forums for other current and recent Toyota models. Maybe inaccuracy is a recently new Toyota policy. The distance to empty and fuel gauge on my wife's 2012 Prius is much more accurate and even a little optimistic. Apparently it "thinks" that EV mode provides more driving distance than it actually does.
Said my last tank, 360 miles , filled almost 16. It wasn't quite empty. I don't let it run dry. Usually near the last line. This time it was below it. Iirc it showed 40 miles till empty at the time of fill-up.
I'm about half tank now. I'll get and post the number next time.
I always felt that the DTE reading was a conservative measure based loosely off estimated mileage on a tank and a few other factors.
Humorously I've always felt the every Toyota had a 'Wartime Reserve' tank after the clock hit Zero. I figure every toyota I've owned can go another 50-100 miles on the Wartime reserve. In case of emergency.
Mine ranges from ~375 (typical) to as high as ~435+
I've found that it depends highly on how you pump your gas as well as the angle the vehicle when pumping.
Fill as slowly as the pump will allow (use first click on handle).
The faster you pump, the more aerated the fuel will be and the pump will stop early, giving you less actual fuel when it all settles and less miles DTE (try filling a water bottle with your faucet at full blast versus a slow fill and you'll understand).
Most stations have a drainage slope, so its best to park with the passenger side lower than the driver's side.
This can account for more than a gallon difference by filling all voids of the tank before the pump stops.