People have turned Prii into campers. Someone give a Tesla a mullet!
"Total cost of electricity spend on the 15,000 km journey? $8.50"
The gas to drive my Civic the same distance would be roughly $600, but I would also need an oil change. You might be able to pay for fuel in a vehicle large enough to pull a trailer for less than a Tesla payment.
I think I have read full-sized luxury cars get about 20 MPG and AAA says the national average is 2.661. 9,300 miles sounds like a lot of gas.
What is interesting is that drove from Arizona to Alabama (or visa-versa) and avoided Texas, you should enjoy some of the cheapest gas in the country:
AAA Gas Prices