It cost 13 dollars to get the hydrogen filled, 40 total to rent the tank, it lasted about a week. So it did offset my costs when driving my ranger, and my buddies F -250, and again this was a very hasty and crude method to inject it into the motor. A nitrious type injection system would suit it better I believe. That coupled with tunning the motor to take further advantage of the hydrogen would yield more impressive results in regards to themileage and theefficent use of the hydrogen. Once I come back from Iraq my buddy and I will persue this further.
Yes depending on certain factor hydrogen can increase emissions, here is a good article which can explain much better then i can.
http://www1.eere.energy.gov/hydrogenandfuelcells/tech_validation/pdfs/fcm03r0.pdf
Its about running either blends or pure hydrogen in a regular internal combust engine, the pro and cons, and how to over come them.
My goal is to running my vehicles either on or supplemented with hydrogen for the emissions factor. With the possibility of building a fill station at our garage so we cam make hydrogen as efficentlty as possible. I feel my Turbo Mustang and next project ranger will make ideal platforms. My goal is to have both my 550rwhp Mustang, and Lifted Desiel ranger that get respectable mileage with little to no emissions. I feel this is not only responsible thing to do, given the slightly excessive but very capable nature of the vehicles. In addition i feel the projects will have a pretty high cool factor as well.
Fortunately for me the motor didn't and doesnt not burn coolant, 195,000 miles and still going.