I paid for a hydrogen unit to put on my truck. What a big nightmare! The guy I bought it from said his wife could put one on in two hours. ha ha I started on Friday night around 4 pm. I was told to stop working on it by my girlfriend 6 weeks later. She was done with me wasting time on the idea. The guy I got it from was the inventor of the unit. I was on the phone with him everyday trying to tweak the unit. It worked for a small amount of time but stopped after working each time. I got so excited when it worked the first time I bought 6 more at a discounted price. The 6 I got are still sitting in my office. He had me mix the water with 50% alcohol, the 91% kind. The alcohol would run a car by itself. So not really sure if it would work at all. I did make the unit produce gas that I would light on top of a glass of water with the tube shoved into it. The unit had to be maintained a lot, it got dirty in just a couple of hours. All in all it was a waste of time money and energy.