a company,xynergy holdings (xynh :otc)has a device that uses distilled water and electrolysis to produce hydrogen using 12 V. testing was done on a yaris.it's 29/36 mpg. went to 60 mpg. average.www.xynergy.com is the site if anyone is interested. don't know how credible the results are -- i just made some money on the stock yesterday, as it went up about 430%.that's all that i care about.people go on about the mileage of this car, but 29/36 is not impressive by todays standards.( assuming that these numbers are accurate).