These documents provide extremely useful information about the viability and credibility regarding the on-board electrolysis of water and results from feeding the resulting gases into the engine.

The International Journal of Hydrogen Energy (a respected, peer-reviewed journal) published a paper by Dulger & Ozcelik in which they found that the production of hydrogen on-the-fly was able to increase fuel economy by 35-40% and reduce emissions by 40-50% in four carburetted vehicles. Log in to see the document.

Obviously this is only possible if the engine is not making full use of the energy of the fuel it is supplied with, e.g. due to a slow/incomplete burn (hydrogen combusts at an extremely high speed, making any fuel it is mixed with also burn faster and more thoroughly).

The document below is produced by the US Department of Transport (2007) and makes specific reference to on-board electrolysis (Hydrogen Injection) and provides affirmative results from limited testing. Refer to section 1.2.3 and 3.5 in Guidelines for Use of Hydrogen Fuel in Commercial Vehicles

Peter has been suggesting that based on his readings applying a powerful South magnetic field to fuel could lead to lowered viscosity and hence better combustion. Similarly a paper from Energy & Fuels (2008) shows that applying a strong electric field does indeed reduce viscosity, leading to smaller droplets during to atomisation, resulting in a 20% increase in fuel economy. Log in to see the document.

This would suggest that a combination of strong electric and magnetic fields could increase fuel mileage dramatically.