This has happened twice. Anyone experience anything similar? DS has just recently received his permit and is driving with us in the car more regularly. Test before driving; he is fine. Get home and 2 times now he is 50ish (both short trips)... Coincidence? Or is the intense concentration driving his BG down? I would have guessed he would go higher from nerves. But this looks more like Math tests where we have seen him go low from lots of focus/attention. So we will test a lot, I guess and arm each car with skittles.