. Well, I have your answer. By using an alternative fuel instead of gasoline you would save (avoid) using the amount of petrol that your present vehicle uses. If you presently walk you would save nothing by buying an electric car If you presently use a hummer with an average mileage of 15 mpg (1) and you traveled 15000 miles per year you would use 15000/15 = 1000 gallons of fuel / year and this is what you would no longer use if you switched to an alternative fuel. However the alternative fuel would continue to have a BTU value and a cost that could be compared on a cost basis or a pollution basis to the 1000 gallons of petrol you stopped using. If you switched to a hybrid this would present the most complex situation. Determining the savings for a prius would be relatively easy but using a Volt the savings are highly subject to driver usage and may not be worth the extra price you pay for the vehicle.

There are so much of comments of pro & cons of HHO, which I’m confused towards this issue. But frankly, if HHO being able to reduce the consumption of basic fuel by 30%, I guess it is fair enough to apply in our daily driving needs. From what I can tell… It goes nowhere, it's a scam.

. Well, I have your answer. Hmm. . In some way, I guess. If you know how the domino effects (machines) work. Though we would not know how exactly it will impact until it does, I guess. It could increase or decrease, or even give it new way, or create a new view on it.