Good question, I’d have to guess, I was on 20% battery when I got there and it was showing 58 miles when I left home so around 50 when I got there.
After charging it said 72% and 225 I think, currently the “guessometer” is saying 70% and 213 miles.
Please excuse spelling/typos. Apart from being a clot it turns out I had one on my cerebellum that's now causing various problems!