This July, 11-17, there will be a NASA sponsored green flight
challenge involving alternative fueled motorgliders with a
$1.65million prize at the Sonoma Co airport in Sonoma, CA. It might be
a good day to try a 320km out and return from Sonoma if you have an
Electro-Taurus, etc (I think it needs at least 2 seats...), but would
probably be a neat event to attend just to see the aircraft if nothing
else.

http://www.flightglobal.com/articles...challenge.html

-paul