There can be electric cars that aren't as sporty and might not be quite so fast (0 - 60 in four seconds is kind of fast) that would be cheaper. If you figure in the fact you aren't going to have to ever have to buy gas again, and perhaps a generous tax deduction, I think they can get the actual price of a standard hybrid hydro-electric car down. Mass production will help also. Americans can do it!
Also comes in larger sizes
So now it is evident that there are already affordable electric cars available for in-town use (not sure if these are rated for highway.)
In-town driving is most of what we do, except for the long-commuters.
So, now, we just add a small version of the hydro thing on that powers a generator and then you don't even have to plug it in. Maybe it activates itself, just like your Mr. Coffee, at 0500 and starts adding charge to the battery. At the end of the day, you could have it programmed to continue running the generator until battery is 100%.
The projects I have seen.. they are trying to run the car with hydro directly, so the point is they don't have to build rome and push the car with hydro, just a hydro DC generator. It doesn't take a heck of alot of power to turn an alternator. It can be even smaller if its used to run continuously or extended, for the seven to eight hours some electric auto manuals state needed for 100% charge up.