In Oregon, and registration was a piece of cake. The engine is Tier 4, and thought the parts per million may not quite meet CA auto standards, it makes so little exhaust tham I'm probably okay on parts per mile.
We did Tioga Pass on the way home from Vegas; it had been closed by snow on the trip down.
There was a nice pic in the New York Times...
http://www.nytimes.com/2008/10/15/us/15eco.html
...and there's lots of stuff on my web site,
Kinetic Vehicles
PS--more about the competition, plus a nice 8 pic slide show at...
http://www.nytimes.com/2008/10/13/us/13eco.html