It has the possibility of working, but none of the guys that make these kits, draw up plans to sell and sell parts to make the kits don't provide any way of storing the HHO and metering it. It's literally like a couple of knuckleheads that heard how it works and made up some kits but they aren't even mechanics. A lot of these claims are by people that have installed them and "think" they get better gas mileage. Half of them can't even calculate gas mileage. When I quantify changes I look at a lot of information for a long time. I have every fill up since I bought my car a year ago, and I am still surprised when I tell myself this should be a fillup, I didn't get on it and I should be at least in the 20's for gas mileage, BAM 17.5 mpg. It's really hard to get straight numbers because people put them on and want to save face and not get taken for a sucker so they say it's way better than it was. Either that or you get someone that means well and let's say he gets 20 mpg and has for a long time, well he ends up doing a tune up and fixing some things here and there installs the HHO and now he's at 23.5 wow a 15% increase in mileage using HHO, there you have it. It's never an apples to apples comparison, and it's never a long term study. Know why it's not a long term study? It doesn't work. You just can't generate that much HHO to offset its power consumption. Think about this. It would take a much larger generator to produce usable quantities of hydrogen, like 6 of the ones on the site listed above. There are more efficient models, but they are harder to make work in anything other than a countertop. This is without taking into account the amount of distilled water needed to be kept on board. Any impurities will cause the unit to fail and lose its already low efficiency. This kit has a 3 quart container, how long do you think that will last. If you do try it keep notes and make sure to quantify the changes.
Jeff