After using this app for a week, here is my opinion thus far.
This app is fantastic. Simple, fun and good info.
That being said, I am not sure about the vampire drain issue. I have been charging to 80% since i got the car at the end of july which puts it at 202 miles. 24 hour period before going to work each morning, the lowest its ever been was 199 or 198.
Since having this app, it now goes down to around 196 or 195. The first week i contributed to it maybe being that the app is new and i open it a lot to look at it. But the past few days i havnt and it is still a bit lower than normal.
Caveat is that the rawmean said he uses "EV watch" for his apple watch complication. So "maybe" its that app that is knocking the few more miles off.
@rawmean Can you confirm your app in the background status for your app and EV watch. As well as the location services settings you have for both the apps?
I was hesitant to use an app if it adds to the vampire drain.
Advice is requested.