A bit of boredom tinkering that will appeal to @AmDismal, @edd9000 and nobody else, I installed Teslamate - an open source data collection application that pulls from the Tesla APIs and uses Grafana to display the results of all sorts of advanced stats.
I installed it in Docker on my QNAP NAS, but there is also a fun guide to installing it on a free Google Cloud micro VPS.
It can also be integrated with Octopus Agile to correctly price charging sessions with their demand-based pricing tariff.