You have no idea how wrong you are.
I will believe Honda Motor Company's collective engineering might on the feasability of hydrogen fuel cell cars long before your amateur comparison to 1930's technology.
Google FCX Clarity.
You can also google brown's gas, HH0 etc. Plenty of guys on youtube who are demonstrating their cars running with this stuff in supplement with gas. These guys aren't promoting any product. In fact they are running homebrew setups.