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.
For what it's worth, I went for a drive in a new D at the Freemont factory 3 weeks ago. To my knowledge at the time, it was the only 1 in the world that they allowing drives in.