Flywheel Power

[RAN]

Another interesting possibility..... http://discovermagazine.com/1996/aug/reinventingthewh842/

[WattGas?]

This is a wonderful idea. (Even if from 1996) A flywheel is a very efficient battery. The drawback, however, is that the physics requires a large, heavy, and expensive high-performance mass, which only makes it practical for large and heavy vehicles (trucks, etc.)

Probably not suitable for a small, hyper-efficient transport like the V1.

Another great idea is the hydraulic hybrid:

http://www.treehugger.com/files/2006/02/60_mpg_ford_f15.php
http://www.nextenergy.org/industryservices/Hybrid__Hydraulics.asp

But this is also only good for large, heavy vehicles. These will always have a place and practical use -- just not for hauling one person to work anymore.