But you’d have to put energy into the system to turn the water into hydrogen gas.
I suggest we include some kind of internal combustion engine in order to generate the energy required to split the water. When this magic car reaches full production, gasoline prices will plummet and will become affordable enough for this purpose.
If gasoline gets cheap enough, I would like to have a super fast water car. This would require 8 cylinders and lots of cheap gasoline to generate all the hydrogen I’d need…