Well. I had it on my 240V charger for around 44 hours. Just drove it around 20. The check engine light hasn't come on, yet (which is basically a first since I bought it a week ago). Will have to drive it another 10 or so to see if it plummets to 0 like it had been, or if I can see a number under 20 in Stealth range. Fingers (& toes) crossed!