Yea, no kidding, I'm willing to tinker around on the getbig message board, but I wouldn't be one to go for patents and publicize it. Fark that. Joker is like needing it to be peer reviewed and shit... No thanks...
Hey man, go ahead and build the thing.
If it works for you great. Tell everyone on here, just post some photos of before and after and some performance, numbers. IE 0-60 before and after. Millage before and after. Proving that water injection works would be awesome.
However, you are better off in my opinion to drive a diesel.
The new voltswagen Jetta TDI is rated at 42 miles a gallon.
Also you could be a smart car
http://www.smartusa.com/faq.html You can also convert them to run on grease from fryers, 240 would be better off doing this because oil tends to congeal in the cold even with emulsifiers. Although I would be an early model diesel for that. You can also buy kits that increase the mileage by changing some of the characteristics of the computer.
I know this works as I have seen many articles written on it, and biodiesel itself is based on vegetable oil.
http://www.hopshop.net/index.php?option=content&task=view&id=87