Using Hydrogen is a whole 'nother topic though. It's doable but like all the other alternative fuels it's not energy efficient or economic unless you invest a large amount of money for the equipment; solar panels, engine tuning, fuel tanks, etc.
Getting 40mpg from just HHO generator would require converting the water into energy many times the current efficiency levels. I'll never forget that Camaro that converted to running on water. Sadly, no pics of the vehicle ever appeared. I'd compare it to cold Nuclear Fusion, it's possible but no one has a sustainable recipe for the reaction. Don't get stuck on the BTU value of a gallon of water either, there's more to energy than heat. The whole concept relies on the ability to "unlock" energy from water. It's not energy conversion it's more like energy harvesting. Atoms hold a tremendous amount of energy but most of the research has been banned, underfunded, or ridiculed out of sight. The few reported successful attempts have used electricity and a certain sound frequency. Whatever the equation is, it hasn't been replicated and was probably just a lucky fluke from something they didn't consider.
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-Allch Chcar
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