I have created an app that quickly can assist you when you're charging and wonder how much you need to reach your destination, based on your required average consumption. First you have to enter your car's typical calculation-value in the app settings. (Tesla Model S typical range calculation: https://www.youtube.com/watch?v=y7Xp7zSp7Rs ) The app has two calculation-modes. You can either calculate your maximum average consumption (Wh/km) to your destination based on current charge, or you can calculate required charge for your wanted average consumption to your destination. The app can be installed from here: https://play.google.com/store/apps/details?id=com.frankburmo.nextsupercharger Constructive criticism is very welcome, so I can improve the app. Also, please contribute by posting your cars typical calculation-value, so that we can create a reference list for the different models.