Yes hydrogen DOES help improve mileage... I encourage you all to tinker around with it and find out for YOURSELF how much difference it makes.
I have been experimenting with HHO production for a while now and can tell you that if you read and study how to actually use this stuff you will see results.
Every vehicle I own has a hydrogen booster helping it save fuel.
My latest project is my s13 with a redtop SR. That's right... I am using this stuff on my sr.
My s13 is basically a stock SR with a 3" catback and a stage 3 clutch. With the hydrogen not only can you feel more power but the turbo spools even quicker than usual when driving for sport.
With hydrogen alone this car is getting 30mpg in the city and 41mpg on the highway!
Prior to hydrogen the best mileage this vehicle got was about 24 city/ 28hwy.
Here is a quick video of the hydrogen running in my sr...
http://www.youtube.com/watch?v=1_8C4ft0IXI
There are no electronic controls leaning out my fuel as has been expertly explained in previous posts. I build such devices and ship them all over the world for other hydrogen experimenters.
So right now I am not messing with air fuel ratio in the 240. Soon I will be installing a wide band so I can watch the engine as I lean out the mix... but that is in the future... so MORE mileage can be possible with tuning.
This summer I also intend to do some actual dyno testing on the power increase on vs. off hydrogen.
I also have hydrogen in my 16 year old 4x4 pathfinder and get highway MPGs in the city! Check my other videos.
I just wanted to chime in with my actual real world results since I saw some folks claiming it is impossible and a scam.
Beware of those who tell you why you can not do something... they have often never attempted any experiments themselves are just parroting other "know it alls" who have also never done any real world research.
I am not here to prove to the naysayers that this works... they will never believe. For those of you curious if this hydrogen stuff can really save gas ...
YES! Find some free plans.... buy the water4gas ebook... just get started! Realistically you can save 10-50% on your fuels cost...
To those of you already tinkering with HHO... keep it up!
Glad to answer any real questions you guys have if I can be of help. I have been a 240sx nut for a decade now so I have a passion for these cars and am happy to help. Skeptics will be ignored as I am far to busy actually helping real people get more MPGs.
~JasonHydroHybrids.Net