Unfortunately that's certainly what seems to be the case. It's not such a huge deal for me, as I only really drive the car back and forth to work (8-12mi each way depending on the route I take), and typically charge everyday.I just remembered that EPA measures EVSE kWh. They show 25kWh to fully charge a new 500e from zero*, which would mean you're at 75% capacity after resetting your % gauge. This seems very close to your numbers above. I'm a bit disappointed by this, but maybe someone can show that it's not that bad.
* 2013-15: "87 miles total range" times "29kWh/100mi" = 25kWh used by EVSE for full charge from zero.
2016-19: "84 miles total range" times "30kWh/100mi" = 25kWh used by EVSE for full charge from zero.
The extra bit of range would be nice for when I would like to take the car our on weekends and such, but oh well 🤷♂️. I'll continue to try and keep an eye on things and see if it improves at all.