Not feasable. Right now it costs more to make hydrogen than to buy gas. Also, from what I've read up on hydrogen, it's not more efficient yet. Just needs more time. Prolly will happen someday, when we run out of gas and end up like Mad Max.
2005 Black Cobalt Coupe 5 Speed
Mods: 15" Eagle Alloy Wheels wrapped in Kumho Ecsta ASX's, TWM Short Shifter, Prothane Transmission Mounts, Progress rear sway bar, sidestrips removed, debadged,Silverstar headlights and turn signals, Injen Intake, painted headlights, Pioneer Headunit, and that's it... for now.