I had to share this because I have been subject to random people revving their engines when they see my leaf.
I only know how to do this on iPhone:
1) Download EngSounds for the iphone
2) Setup your phone for bluetooth audio into your leaf stereo
3) Run the program and select New Interactive...
I was at the opening event for the first public charging station by Ecotality. They put in chargers at Balboa park. It was a GREAT turnout. I think it was the largest gather of privately owned leafs around. Anyone there get an accurate count?
-Joseph