[dcb]

No offense, but I think the jury has already returned a verdict on hydrogen, and it is considered a storage medium and a pretty crummy one at that, unless you are building a rocket with LOTS of other peoples money.

But little sub $1000 econoboxes with a stickshift can be finessed to 50mpg pretty easily (to 100mpg+ by some patient masters), sub $500 motorbikes get about 100mpg without trying too hard, theres a lot room for improvement on the cheap, especially for a do-it-yourself modder.