Two different gauges for two different things. That one is your fuel gauge, not a traveling estimator. It's showing how much energy you have left in your battery. Otherwise that isn't shown anywhere else. You wouldn't want your fuel gauge moving up and down based on how you are driving. So they can show it in %, or they can show it in an approximate distance, but that needs to be based on some general consumption constant so that it doesn't do crazy stuff like jump way up when you start going downhill.
I added your correction in there.
Yes, the car does this elsewhere in a better way than that battery meter. This is a part of navigation. When you enter some destination in navigation, where the traveling distance would matter, it does an ongoing realtime calculation based on your current, real all-inclusive energy consumption and projects that out over the rest of your drive, including any elevation changes, and shows you a % remaining on arrival that updates every couple of minutes. That is an immensely helpful feature, so you can just keep an eye on that for any long trips, and if it is dropping too fast, to 12%, 10, 8, etc. you'd better slow down some to reduce your energy usage, to get that projection to creep back up to a safer level.
