Well.....it is out there.
http://www.water-for-fuel-scam.com/index7bfuel.htm
They have tried these in the Big Rigs too. Not so successful with the Diesel Engine.
On the news the other day they had a test car running around Tokyo running with just a Hydrogen Generator. Only water as the fuel.
Everyone was sceptical about running a Diesel on old cooking oil....now look. XTreme 4x4 was showing in detail how to make your own Bio Fuel. Works out to $1.20. Kit costa $8,000.00.
Don't blow off the Hydrogen idea too quick.