This article initially seems to investigate so-called water powered cars. The final few paragraphs of the article however branches off into discussion about a system where (as I understand it):
- A car's electrical system (powered by its alternator) is used to power an electrolyzer of water, which
- Generates hydrogen and oxygen gas, which
- Is fed into the engine's air intake, and
- Improves the way the gasoline burns, thus maybe increasing overall fuel economy (ie km/litre or miles per gallon)
Obviously (to anyone who knows their laws of physics anyway) any improvements in the way the fuel burns would have to more than make up for the inefficiency of producing the extra electricity to split the water into hydrogen/oxygen. However, in cars where the fuel burns inefficiently in the first place, maybe there is the potential to improve overall fuel economy? This seems less likely to be possible in modern cars where more effort has been put into designing an efficient engine.
The article is old (2008), and suggests that further work would be done, but provides no link. Can anyone shed light on whether this research has been pursued and what the results were?