Maybe others have seen this already, but here it is again:
Piaggio is going to introduce a Hybrid engine to several of their models,
including the MP3.
It can be plugged into the wall, or charged by driving it.
It will have up to 85% more power?
Check out the article:
http://www.metaefficient.com/archives/electric-bikes/170mpg-hybrid-scooters-by-piaggio.html