The bottom line is it takes more energy to make the gas than what you get out of it. End of short story.
"Free" energy exists. It's called Solar, wind, Biogas and Hydro. ANYTHING else is bunk.
I got inquisitive on this about 15 years ago. I guy I knew that was a very straight shooter tried it and claimed he was getting better mileage with the setup he had. He'd always measured his consumption very carefully and was very precise in everything I knew him to do. He wasn't trying to convert anyone, just talked about how he too was surprised but couldn't argue with the results he was seeing.
Against our better judgement, I Set up a test with ho ho ho gas based on this as it got another mate and I very inquisitive about it. I got a small diesel engine, hooked it to an alternator and a load and ran a long clear fuel pipe that I could see and measure the fuel being used. Mate and I ran tests all afternoon documenting everything and doing each test multiple times and in random order and making the test as legit as we could.
The thing ALWAYS used more fuel with the gas generator on than it did without. I even tried cheating running the gas producer off a battery and the thing still didn't make any improvement to the run time with the gas more than the margin of error we got just repeating any test multiple times.
We caught up with the guy running it on his car some time later and told him of our results. He said he was wrong. At the time he put the gas machine on his car he started measuring the fuel he put into it with a drum to be accurate. He made the mistake of taking the 25L drum he used as 20L so in fact he was putting more fuel in the car than he was aware of and naturally saw an improvement over his previous measured results because of that. I also pointed out that with the unclamped push on connections he was using, he was virtually carrying and making a bomb out of the trunk of his car. He saw the point and removed the devise and that was it.
Of course running on a flammable gas works, it just doesn't work to improve combustion, get higher mileage ( the complete opposite in fact) or pretty much anything else they claim foe ho ho ho gas. It's simple physics, every time you convert energy you loose some. There is no " Over unity" in energy either. That's also crap touted by people that I can only assume have hollow lives and need some sort of alternative religion to believe in.
Using an engine to drive an alternator has a loss in the transmission through the belt. The conversion of the mechanical power in the alt to electricity has a loss. There is a loss of the power going through the wire to the gas machine. There is a loss of energy converting the water to gas in the form of heat alone. Hydrogen is a tiny molecule which will leak out connections that are water tight.
The combustion process has losses that they will make up a lot of rubbish about that Hydrogen makes more efficient.
It's all Bull.
The thing that makes me laugh with this is if you go to pains to build a gas generator and put it on... whatever, and don't instantly get 400 MPG, you did something wrong. You didn't make the machine right no matter how close you followed instructions. You are .0003 of a volt off, your solution is 1.1 Ml off in a 10L machine, The trammy phase girdle spring inductor is out of phase, you didn't align the thing with the waning globus phase of the moon on the planet Zorg or you didn't wait to build it during the salmon run in Slovakia which is critical to the whole process and you should have known that.
Then of Course Bill Whathisname from wherethefukarewe, Backwater USA comes along and says how he found a rusty old tin can by the side of the road, pissed in it, ran a couple of bits of fencing wire into the thing and connected it to a battery from a radio he last used during the war, the Boer war, put the thing in the back of his pickup he hasn't driven since 1970 and suddenly the thing got 96 MPG on the still flat tyres and ran 5.6 in the quarter at 264 MPH. All the fairy dust and unicorn believers will all then chime in to congratulate him on a job well done and hold his testimony as irrefutable proof that this dose work and there is no possible grounds for claiming it doesn't and anyone that doesn't believe in and worship the idea is a stooge for the oil companies trying not to let the secret get out!!
It's unbelievable in how brain washed people can be with this crap!!
But I have worked out the way to make it work. It's so easy! All you have to do is forget about, fact, logic, physics and if you have a low IQ, are very gullible and believe everything you hear or read, this rubbish works brilliantly. Helps if you are able to kid yourself and have a great imagination as well. Then you can REALLY get this crap to work well.
Yes, you can idle your lawnmower from the gas fed in and generated by another energy source. The amount of power you will use will probably cost more than running it on petrol to start with. Then you have to make the generator, buy the support equipment set it all up etc. You ever seen a vid of anyone actually MOWING their lawn on a bottle of this? No, I haven't either and its a whole different thing to put this in practice than make up a BS demonstration.
I haven't spent more than about $50 a year on fuel for the last 13 years next month. I run my vehicles on veg oil. It works and there is no Voodoo magic or setting aside principals of physics required. I can demonstrate it all day long by filling the tank and driving all day ( with a top up) and then driving back, like from interstate, which I do 2-3 times a year.
Now, You ask some clown to do the same on Ho ho ho gas and show you the saving they make on consumption with you sitting there beside them. Never going to happen.
I have just started playing with Biogas. Put all your kitchen and food waste into a an airtight drum and get gas out. 10's of thousands of setups around the world including a couple not far from me that uses that the gas to run a turbine to make power. Now you could make the gas with this, compress it into a bottle and use that to run your mower, car or a generator as many do in places like India. that is real and demonstrable, Ho ho ho gas is not in practical similar application or live up to the claims.
One of those claims I have read about so often is that the ho ho ho gas increases efficiency of the fuel burn in an engine.
They cite efficiency numbers that illustrate they don't even know what the fluck they are talking about to begin with. They will say an engine only burns 50% of its fuel. If that were the case, where does the 50L per tank full go on my truck that doesn't get burned? It's not running out the tail pipe, its' not filling the sump so where the hell is it going? Of course ho ho ho gas will make that 99.9 % fuel burn and I'll now get 4 times the mileage and some other disproportionate amount of power.
Of course what some of these idiots mean is the engine is only 50% efficient. If it was THAT efficient, it would be almost 20% better than teh best modern tech has come up with. The huge, slow 120 RPM diesel engines in ships are near 50% efficient but the engine in your car is barely getting past 30% efficiency.
The engine is burning the fuel VERY efficiently as can be verified by emissions tests that show unburnt fuel amounts in the hundredths of 1%. That being the actual case, how is the Ho ho ho gas going to improve the inefficiency? That's in the mechanical friction, heat loss and other things, not in the fuel burn. That's the one thing an engine does real well, Burn fuel. It's converting the energy to mechanical power where it falls over.
As far as this malarky goes, I strongly suspect you would be better off putting the energy used to generate this laughable gas into charging a battery to drive a fan to help push your car along. I would guess the efficiency would be just as good (poor!) and maybe better.
The gas WILL run an engine, no 2 ways about that, it's just creating it by electrolysis is HIGHLY inefficient and there are problems with transfer and storage and the over all process being a substantial energy Deficit.
If you want to run your lawn mower or car off free energy, get an electric one and charge the battery off a solar panel array. :0)