[gwbas1c]

> collect facts

The physical properties and limitations of hydrogen are well-known. Many people repeat them in other posts in this thread.

Here's a very factual explanation of why hydrogen internal combustion engines won't work: https://www.youtube.com/watch?v=vJjKwSF9gT8

(In summary, you can't compress hydrogen enough to fit in a reasonably-sized tank. The energy that it takes to compress hydrogen will be expensive.)