This app had great reviews so I figured I’d give it a try. Not sure if I’m doing something wrong, if the phone Hass to be held in a vertical position, that’s ridiculous. Very difficult to do in a car without a specific mount. My phone sits about a 45° angle. I tried this app multiple times, I hit 60mph every time - the app never showed that I got past 40mph. Now just driving around, it’s very accurate, it matches the speed of my car identically but it can’t handle the rapid acceleration part. Edit: I downloaded the app again months later and thought I would try it. 0 to 60 in a performance model three Tesla still says 9.7 seconds 0 to 60, repeatedly. I hit 60 miles an hour and it doesn’t show up for another six seconds.