There is actually a national association for this. http://www.nedra.com/ The specific energy (Watt-Hrs/kg) of gasoline and hydrogen are quite high (which is why we drive with gasoline) compared to batteries or flywheels which have ~100 times lower specific energy. The specific (theoretical anyway) energy of Metal Oxide Capacitors in development is 10 times lower still. But the specific specific power (Watts/kg) of the capacitors is 10-100 times higher than that of gasoline or hydrogen. This means a capacitor-powered electric dragster could someday produce 10-1000 times the thrust of a hydrocarbon-based combustion engine. Anybody know what the tires would have to look like to grip the pavement for such a beast?