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I tried a HHO system on a Duramax and it yielded good mileage increase. It did not double my mileage but for the few months of experimenting I was above 25mpg. Typical unloaded driving with easy throttle foot was 21 to 22 mpg (pre HHO).
Most disbelievers in using hydrogen like this immediately start off with laws of thermal dynamics and such. They all still apply of course but are irrelevant when looking at if and how hydrogen increases efficiency.
Here is something I didnt see mentioned in the first several pages of posts in the thread, apologies if it gets covered later on. On any ignition cycle a set amount of fuel will be injected. Lets say that hypothetical amount for our parameters (cruising speed, low load, minimal throttle) is .100 grams of diesel. Let is also say that .015 gram is passed out the exhaust unburned. Adding HHO must have the effect of reducing that .015 gram of waste to say .005 gram. There is where the fuel savings and energy to split the the molecules comes from.
The computer is going to inject that .100 grams regardless if it gets burned or not. The hydrogen having the effect of reducing the waste then allows for a slightly less throttle setting and thus reducing the injected fuel for the same speed/throttle/load parameters to say .085
Of course this is just my theory on why I gained several MPG. I dont really need the answer, just knowing it made a difference was enough. My mileage was hand calculated not from the driver information center readout which is often times several percent off plus or minus.
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