Rule-following entry --CONTEST: Fluid powered car

I was only getting started when I seemed to discover almost-perpetual motion. I am still working on a much more awesome entry, though.
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Since a few people are trying fluid powered cars, let's speed up the research and development by making a contest out of it.

Make a car powered entirely by fluid.

-- Rules --

Well I could make a long list of rules but the premise is pretty much the rules. As long as the car has no power source other than fluid it'll be accepted. Obviously delete my example car.
One definite rule is that it must be a derivative of this level (makes it easier for me to see all the entries) and derivatives must be allowed before the contest closes (for judging).

The winners will be based on efficiency, speed, style and ingenuity.

Contest ends in 2 weeks - Have fun!