I thought I would post again this weekend to clarify some simple things. I'm happy with the response i have had so far with everyone and I hope this is something that can benefit many. I will try to have something interesting to post weekly, but this is really just a follow-up to the earlier comments. I really want to stress that I don't know how well this device will actually work. I am unsure of the exact mileage increases, BUT I have read many different results. (anywhere from 20-100% mileage increase). It has a lot to do with tuning the components for maximum performance and tricking your vehicle into thinking its still running on 100% gasoline.
I say tricking" , because running the HHO will have your car running lean (burning gas more efficiently) and making your O2 sensors think the engine is starving for gas, when really its just working better. This is where the definitions i promised earlier come in.

THE EFIE- is the Electronic Fuel Injection Enhancer. It doesn't really enhance too much more than the voltage on the O2 sensor. While running, your car's o2 sensor will produce a variable voltage from 0 to 1 volt to your vehicle computer. When running lean, that voltage is lowered and will trip your check engine light in the car. (not good for mileage). The EFIE is attached above the o2 sensor and will add that extra voltage that keeps the car thinking it is running normal. Tuning comes in to play here. Each cars voltage readings will most likely be different.

The PWM- is a pulse width modifier. This device is a bit more complicated and I can't claim to know everything about how it works. It basically will get hooked up to the power input of the cell and adjust the frequency of the voltage going in. This helps produce more gas with less amp draw. It also helps keep the cell temperature down. I will need to research more about these as I have not found one that I would purchase yet. They are not required to run, but should be considered later on.

And the test MULE is....
This is my ride right now. 96 saab 900s . a 2.3 liter power house. Right now the four cylinder engine is getting a rough 25-28 mpg avg. In the next week, I will get exact mpg readings and be filling up at the same gas station to keep it as close as possible.

I encourage everyone to research more into this project. Youtube is teaming with great do-it-yourselfers, trying the same thing. I hope to post videos in the future. Try searching "water fuel cell" or "HHO Cell". Also check out "Stan Meyer" who was a pioneer in this technology/science.
Until next time