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.
Check the filters on your app. It my be filtering out "requires fee" or applying some other filter that takes out potential charging spots. Up there you want to know all your options. Good luck!
I made that trip. But I used Owen Sound to charge it up. But if you are in Tobermmory for 2 night I would use the wall plug and get 7 kms per hour. Most of the time the car will be parked I assume.