Now I'm really baffled. On my way back from Oban, intending to charge in Stirling, I really was tired. I knew I was a bit impaired, I had to keep pulling myself back to alertness, but I wanted to get to Stirling and get the car on a charger before I stopped. I got there, connected up to the Osprey, but I only needed eight minutes so it wasn't worth leaving the car.
After I'd disconnected I moved off the charger and parked up by the pub and ordered coffee, because I knew I wasn't fit to go on. A cappuccino and croissant later, and a couple of chapters of the book I was reading, and I was good to go.
But I still never saw that coffee cup alert.