Well it may not be in the software now, but here in the Netherlands we have, thanks to a Dutch programmer, software that does the trick in calculating elevation and the related estimated energy consumption.
A week ago we made a trip through the Swiss Alps into France to the vicinity of St. Tropez v.v. The software of this guy, forum name Merijn, predicts nicely the extra energy needed when driving from one supercharger to the next (or any other location on the map you are driving from/to). Everything worked fine for us, it is very handy indeed. Maybe you can convince him to adapt (or help him adapting) the software for the USA routes and superchargers?
By the way, to get a grasp of the software (in Dutch), go to Tesla | Home and click "Hoogte" (which means 'hight') and you will get an idea how it works for Europe.
There is EVTrip planner that does similar. The point Vger was making is that weather conditions (wind, temp, precipitation) and road conditions (elevation gain/loss, congestion) are all available in real time so Nav should be able to factor them in to not only give you an ETA but also predict, with some accuracy, when you absolutely will need to recharge. Plus, it would give you options for where to recharge. In addition, it would monitor driving behavior and actual consumption to improve the prediction while driving. The apps are nice but having the capability in the car is much better. To simplify it - the car should be able to tell you what you can do and help you find your next recharge point.
