Right from the start of my ownership, it irritated med that I could not calculate the optimum speed to drive until I reached the next charging station. So I always was too conservative, ending up wasting time. To get a better Idea of what speed to drive, I made the app https://itunes.apple.com/us/app/leaf-speed/id1239220786?mt=8 which gets the weather, helps you calculate the distance and then recommends the highest speed you can drive to get here.