You can install our site as a web app on your iOS device by utilizing the Add to Home Screen feature in Safari. Please see this thread for more details on this.
Note: This feature may not be available in some browsers.
It was confirmed with a number of inside sources that Tesla does reserve a small buffer beyond the "zero" point on the mileage estimator. I definitely don't recommend anyone relying on this buffer to save their lives, but it's definitely there.