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.
FWIW, worked great on my first supercharge.
Granted, my glovebox is still nonfunctional, and the app/phone key hasn't worked since about 6h after I picked up the car, but... all in good time?