It's expensive to refuel ($3,000) but since the range is around 4,200km 
they're getting 1.4km to the dollar (close to a dollar per mile).  Still 
about 10 times worse than gas prices in the US assuming $2/gallon and 20mpg.

I imagine that the energy costs of the circuitry and sensors is far 
greater than the propulsion.  Using a much lower power system they could 
probably double (or better) the range.  Still cheaper than hiring a boat 
and crew to do measurements for those same 4,000 km.

-Adam

Luis Moreira wrote:

>Hi Guys
>Though that this would be interesting...
>
>http://spray.ucsd.edu/
>
>
>If anybody has any more info please let me know, I think this is just
>brilliant. 
>Regards
>	Luis
>
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