As I thought it through more, hydrogen won't work.
Even if you could get it anywhere...
You'd have to live in a place where the temp stays above freezing...since the reaction taking place is something like H2 + 02, you get H20, water. So you're driving down the road in your 1st gen Miata hydrogen, or RX-8 hydrogen, but it's, lets say, 25 degrees F outside. You've got freggin water as exhaust, it's gonna freeze in the exhaust and kill the engine(most likely, flood, hehe). So you buy an exhaust heater, takes care of the problem. But wait, you're putting water on the road, and it's turning to ice. So while you're humming down the road, people driving behind you are hitting patches of ice. Doh!
Forgetting the fact that hydrogen is the most active element known to man, lets say you're filling the tank at your local Amoco(Sorry, BP), and you accidently pull the nozzle out before you stop fueling. You're toasted.
There was this electric car on TV a while back, it made its power by replicating the sunlight in these 3 things in the trunk of the car. It looked like a Delorian, but it wasn't. Anyhoo, it did 0-60 in like 6 secs, and had a top speed of around 160. Pretty neat, but it wasn't for sale(I don't think), and it would cost a fortune.