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.
I live 10 minutes west of the MGM Grand and even hypermiling all the way, my Leaf was only able to make it to the fire station before my range dropped to zero. Was able to coast back down and regen enough to make it home. I don't recommend making that drive in an older Leaf.