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Using a HHO (Brown's gas) generator works. I have friends getting 25-40% better milage with that alone. We are going to put one on my sons older PU truck before I try it on our newer vehicles.

Be extremely skeptical and cautious. I have a $200,000 engine dyno (I make airplane engines). I have tested Browns gas, it lowers the octane rating which retards the timing, not a good thing. If you accidently rev the engine you will destroy it. I have gotten good at destroying engines, lots of practice : )

What I have observed is that people who use these devices alter their driving behavior and tune up their vehicles. It is very easy to get better gas mileage simply by idling less, driving a little bit slower, not accelerating as quikly, etc. My dodge Cummins diesel pickup gets between 15 and 25 mpg depending on how I drive it. I think that driving into the wind as opposed to driving with the wind makes about a 2 mpg (10%) difference.

The bottom line is that gasoline is a very good fuel. Changing the composition by adding hydrogen and/or oxygen in any form has very marginal benefits, and a lot of potential bad effects. An engine is just a pump designed to run very close to the stoichiometric point, if you change the composition of the fuel too much be prepared to replace the engine.

I talk to these snake oil salesmen occasionally and I find the silence very telling when I tell them I would like to test their product on a dyno. More often than not, that is the end of the conversation, they lose interest in selling me the product instantaneously. I have even wondered if it isn't some kind of disproof of Einstein's theory of Relativity.

What I have observed is that people who use these devices alter their driving behavior and tune up their vehicles. It is very easy to get better gas mileage simply by idling less, driving a little bit slower, not accelerating as quikly, etc. My dodge Cummins diesel pickup gets between 15 and 25 mpg depending on how I drive it

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I drive a Ford Ranger with the small 4 cylinder and manual transmission.

I normally get 29/30 mpg. Since most of my driving is within 50 miles, the few minutes difference between 65 and 75 is worth the difference in gas money.

Here a while back I had to get about 400 miles away in a hurry and was not worried about gas millage. At 75/80 mph, my gas millage dropped to 19 mpg.

Congratulations, I find your post to be the most informative and credible in this thread.

One of these things can be built for about a hundred bucks. I’d like to see one dyno tested and put on a five-gas analyzer too.

I have a new Jeep and an 06 Mustang GT, and I dont’ want to risk either one. I need an older car to try this with. I understand you’re supposed to advance the timing and mod the O2 sensor to make it work correctly.