For what it's worth, I have a Nissan standard petrol car and it's pretty much the same. Every time I fill it up, it says I have 400 miles of range, then by the time I've driven about 300 miles, I've only got a few miles of range left.
Interestingly the accuracy seems to get a lot better by the time I'm down to half a tank. I don't know if it's a sensor issue, or maybe my driving habits just change a lot when I have a full tank versus when I'm running low.
The type of driving and time I'm driving can also make a huge difference to my trip MPG - some trips I average about 10MPG, others closer to 40MPG. Generally speaking, low speed but clear rural roads get the best, followed by motorway, followed by pootering around the city. The absolute worst mileage is during the winter, when I might only be driving lots of short trips around town on a very cold engine, with the headlights on, in the rain. In that case, I might only get around 200 miles out of a tank.
Anyway, my point is that knowing the specifics of this trip's fuel consumption is a much easier problem than knowing how many miles it'll be until you next need to refuel.
Yes, my Mazda does the same. It will happily report a 450 mile (725 km) range on my 13.2 gallon / 50 L tank, when I have never gotten more than 380 miles. Sometimes much less. To be fair, if you cruised slightly above the speed limit on the highway in fair conditions and drove it to truly empty, I think you would actually get that. But the gauge reads empty when there is easily 1.5 gal / 5.7 L in the tank, so in practice there is no way you're going to get the stated range.
However, the key difference is that my gas car can be filled up anywhere, and worst case I'd need to get a gas can. Running out of charge is a flatbed tow, that's a huge hassle. The range being accurate is a big deal on an electric!
Here there are some vehicle recovery services where they can dispatch a van with a giant battery in it to charge your stranded EV enough to get to the next proper charger.
Still more of a pain than a petrol can but better than a flatbed!
Interestingly the accuracy seems to get a lot better by the time I'm down to half a tank. I don't know if it's a sensor issue, or maybe my driving habits just change a lot when I have a full tank versus when I'm running low.
The type of driving and time I'm driving can also make a huge difference to my trip MPG - some trips I average about 10MPG, others closer to 40MPG. Generally speaking, low speed but clear rural roads get the best, followed by motorway, followed by pootering around the city. The absolute worst mileage is during the winter, when I might only be driving lots of short trips around town on a very cold engine, with the headlights on, in the rain. In that case, I might only get around 200 miles out of a tank.
Anyway, my point is that knowing the specifics of this trip's fuel consumption is a much easier problem than knowing how many miles it'll be until you next need to refuel.