How soon before we can have a steam powered car

[Pistom]

I found this

http://www.cyclonepower.com/index.html

And it got me thinking how soon we old see this in a car. Obviously not a commercial venture but I love the idea of a super efficient modern steam powered car.

[Raize]

"has achieved verified thermal efficiencies above 30%"

So basically it's a piece of st that even on the best fuels they can run it own can only manage a bit over half the efficiency of a ICE.