I've been using TezLab and it's been great. No noticeable phantom drain. The app will ask you, when the vehicle is asleep, if you want to wake it to ping the car. You can still view a lot of the stats while it's asleep, too.Sounds like phantom drain isn’t an issue with Stats.
What do people think of the other apps like: TeslaFi, Nikola, TezLab, etc.?