An easier way for most motorheads to get their helmet around that figure is to use Tesla's own specs - 240V @ 70amps for 3.5 hours.
Anyone who has stick welded 1/2 day non stop on 14 guage or better sheet metal should have a pretty good idea how much juice this puppy drinks every 240-313 miles.
They claim that a comparable sports car uses $2 per mile of fuel while the Tesla uses 2 cents per mile. I submit that each figure is equally inaccurate, and am not going to qualify either.
A fellow I know who's a far more talented and accomplished boat builder than I built a beautiful electric powered wooden boat, about 20 feet long. It was an awesome blend of classic yacht and electric propulsion. It only needed to use enough power to get it up to hull speed, roughly 5 knots. Anything more in a displacement hull, and you're just trying to climb your bow wave.
I have a few row boats waiting on me to finish them, and I'd love to offer a clean install of electric auxillary power, but other than a Minn Cota transom mount outboard, there's not really anything ready to drop in.
The R&D would be much more interesting if the industry wasn't stained by the hype and grant seekers.