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28MPH when the car is fully charged, I assume? How about when the tank is 1/2 full? Does it have a heater for the winter?

A novel idea, but if we're going to make people movers, electric sounds like a more realistic implementation. An electric go-kart isn't that hard to mass produce.

Also, I'm wondering if these guys have mane any progress, lately.

Such as the Quasiturbine engine

Or the wankel, or Rotary, engine which is even used today. While the rotary might not get better gas mileage than a piston engine, it certain produces more power per displacement than a piston engine. Furthermore, the newest rendetion of the wankel, the Renesis, developed by Mazda already uses some of the benefits that this engine supposedly does. Namely with the exhaust ports.

The design of the piston engine is flawed. Moving up and down robs your engine of momentum and is just plain silly. Going around in circles produces much more power. If only the Wankel engine, or better yet, the quasiturbine engine had as much R/D put into them as piston engines, we'd have a lot better combustion based engines.

Reactors use fuel to heat water to drive steam driven turbine generators right.

How much heat is needed? How many turbines are there? Could we not instead of using uranium, rather
use photos to heat the water from the sun, fed by giant lenses fed by fibre optics, so we could in effect
have lots of collectors 10m wide funnel the light down 1inch fibres all heating the water pipes
which drive the turbines. Sure its only during sunlight, but damn, its 100% free once running. Even during
cloudy days, but not real real dark days. So what surface area do we need to equal a nuke plant? The surface area
of the nukeplant perhaps?

Something like this - http://www.eia.doe.gov/kids/energyfacts/sources/re newable/solar.html#Parabolic%20Trough
or http://www.enviromission.com.au/project/video/vide o.htm (build 10 of these babies)
and http://quasiturbine.promci.qc.ca/QTVapeur.html for more info

"Would all the air come out too quick to make it worthwhile?"

Depends on the engine you use. Take a look at this engine http://quasiturbine.promci.qc.ca/EIndex.htm/.
It runs on difference 'energy sources'. The compressed air version is quite impressive. The natural gas version is coming along nicely. As for 'conventional fuel' it's not one of there priority.

I have seen the compressed air chainsaw prototype at work http://quasiturbine.promci.qc.ca/EProductQT75SCCha insawSurvey.htm/. It really works.

They are now working on a car prototype.

"Would all the air come out too quick to make it worthwhile?"

Depends on the engine you use. Take a look at this engine http://quasiturbine.promci.qc.ca/EIndex.htm/.
It runs on difference 'energy sources'. The compressed air version is quite impressive. The natural gas version is coming along nicely. As for 'conventional fuel' it's not one of there priority.

I have seen the compressed air chainsaw prototype at work http://quasiturbine.promci.qc.ca/EProductQT75SCCha insawSurvey.htm/. It really works.

They are now working on a car prototype.

The thing I can't help but wonder, is why if these are so effecient, is why there isn't one under the hood?

That's because of low power-to-weight ratio, because they take time to start up, and because they run at a constant, low RPM.

They are used a lot as power generators, on boats for example.

But that could change some day. There is this company that tries to manufacture and market an aviation Stirling engine. And I'm working on a very low weight, variable-RPM Stirling engine based on this concept of an improved rotating internal combustion engine.

Checkout this "green" engine concept, it's fascinating. It's
half way between the Wankel rotary engine and the turbine is a new engine/pump that could very well replace the 200 years old piston engine; it's way more fuel efficient it's 1/5 lighter for the same power and has a wide power range with torque at low rpms(lessening the need for a gearbox for automotive application, and is 1/20 less noisy, and will run on a wide variety of fuels with very little/no polution because of prevented NOx formation. The inventor, Mr St-Hilaire, has a PhD in Physics, but is not too good at web designing as you will see. ;-). Here is a pdf file explaining the concept.

Face batteries are still not an option for the transportation industry, and the fuel cell is still in it's infancy and in both cases the whole car has to be redesigned. This engine concept is a great intermediary step, it could get integrated in existing infrastructures.