Re:52 kilowatt Hours? (Score 2, Interesting)

Maybe, maybe not. It's also the case that a battery (like in the current Tesla) has mostly constant power and voltage output over its whole discharge range, whereas a capacitor outputs power more and more slowly as it runs down. I'm not sure that would be acceptable in a sportscar... or maybe the discharge rate in the capacitor is plenty high to begin with? In either event you have to deal with variable voltage output from the capacitor system, which may make the electronics a lot nastier...