Huh, re-reading your OP, it does sound like a FMM. I've never experienced that since I always use a little gas every day. You can interpret your post in both an alarming tone and a "oh yeah, that's FMM doing it's thing" tone. Thank you for updating with the final prognosis! Sure educated me. I'll have to remember this if I ever get a shorter commute and skip the petrol habit.