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Water as fuel
A number of websites and mail-order organizations promote ways of using water as fuel or to assist in fueling a vehicle. This is an appealing idea, but also a very old and misleading idea. To use water as a fuel is not only unproven, but actually impossible according to the laws of physics - in particular, the first law of thermodynamics.
Water injection: established technology
Note however that water injectionW for cars is an established technique that does not use water as fuel, but rather as a way of cooling the intake, increasing the effective octane level of the fuel, and thus allowing greater compression.
- Water Powered Cars Will Never Work, ecogeek.org.