I have been looking to see if one of these hydrogen fuel cells you can build yourself would work on my car, and there are quite a few books out there that show you how. Unfortunately, they are not all the same.
I bought about 5 before I figured out how to do it, and then bought a few more to see if there was anything else to learn. It’s good news for you though, since I have put my comments up about each one, and ranked the top 3, so you don’t have to go through the pain I went through.
If you are like me, and being hit hard by these gas prices, and the cost of commuting to work, then you might want to get that top ranked guide (the only complete one, by the way) and put one of these HH things in your car. It really makes a big difference.
You’ve probably heard that the gas companies don’t like anything that lowers gas consumption, but the good news is once you know how to make one of these, there is nothing they can do. It is just common hardware store gear, and less than an afternoon to make it and install it. Since it works for every type of car – even diesel, you can really extend your wallet by quite a distance by taking positive action.
It’s really the environment you are helping when you use one of these, since emissions are lowered, and everything runs better – cooler, so even your engine will have an extended lifespan.
It’s a win-win situation, for you, your family, and your car. Everyone except the gas companies (but they own the federal reserve, and can print money on demand, so don’t worry about them).

