Also... FYI... I did look and there are 3 tesla superchargers on Whidbey Island... depending on where you are staying I would do it!

I rented a tesla... it was pretty cool... when you told the car where you wanted to go it would figure in your current charge and factor in charging stations.... I would definitely do it again... but make sure your rental comes with the adapter so you can charge at any rental location and not only tesla stations