I just purchased this today. This particular one is over $175 now on ebay but every few days or so he'll have a buy it now for $99 on one. If you don't know what they are, it's a device that splits water into H2 + O and you inject it into your car. It's a process called electrolysis. It does work! Way back in school we did an experiement with it. I've done alot of research over the past 2 weeks and i've found sites on the net with plans. The best are the ones that use a PWM voltage signal. I'm not sure what this one is. My plan is to reverse engineer it and possibly make it better to generate more H2. They are selling like hotcakes and he has great feedback on them. Do a search on ebay for Hydrogen Generator. This particular ones seems to be the best one. I'll post back on my success with it. I'll be happy with anything between 2 - 5 mpg extra, but would be really happy with more. I ordered it because the winning bid price keeps going up. A few days ago they were in the $150 range, now they are in the $180 range. Watch for the Buy it now ones that appear. I got lucky and got for $99
http://cgi.ebay.com/Hydrogen-Generat...QQcmdZViewItem
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