I was using TezLab but I'm pretty sure it was contributing to my excess phantom drain at the time. I saw something about them updating it soon to add additional "sleep" settings. But in their FAQ, they mention that when they detect your phone moving, they ping your car to check its state (driving or sleeping). If its driving, then the app starts a "trip" in the app that it later logs the data to.
So my thought was that if I'm carrying my phone with me and I'm walking around at work, it seems like it would be pinging the car an awful lot. I believe this is true because while I was using the app, I noticed my car was rarely "sleeping" (when I open the Tesla app, I rarely saw the "Waking Up.." at the bottom).
I've heard that TeslaFi is better in this respect. They seem to have some kind of sleep settings you can use.. maybe to block off certain parts of the day so it doesnt bother pinging the car. In any case, I decided I'm happy just seeing the "Last Trip" data on the screen. I dont need to log all that crap at the expense of 15+ miles of drain per day.