http://www.hydrowaterpower.com/
water is supplemental to gasoline (petrol) or diesel fuel. However it is possible and VERY EASY to extract energy from water to run your car on water too.

We have water-to-energy converters running in all our vehicles since 2006. YOU CAN TOO. I'm about to tell you about a SIMPLE technology you can have right now, called Water4Gas. It's one of the most PRACTICAL free-energy devices, marked by extraordinary simplicity and effectiveness.

Water4Gas is NOT my invention. And it's not new. Based on old "forgotten" science that is well documented in US Patents we have developed devices that use a little electricity out of your car/truck battery, to separate water into a gas called "HHO" (2 parts Hydrogen + 1 Oxygen). HHO, also called Brown's Gas or Hydroxy, burns beautifully and provides TONS of energy - while the end product is just WATER! Mobile Magazine says: HHO provides the atomic power of Hydrogen, while maintaining the chemical stability of water.

DID YOU KNOW: Pound for pound HHO GAS IS 3 TIMES MORE POTENT THAN GASOLINE!!! HHO is a fast growing trend for boosting performance and MPG.
# We took a 90-year-old suppressed technology,
# We SIMPLIFIED it using everyday hardware,
# You will discover how affordable yet very effective these devices are.
# You get permission to replicate our devices - for personal savings or business profit!
# Easy to install & maintain.
# Good for carb/fuel injection, gas/diesel.
# Old/new cars, motorhomes and now even big rig trucks with our "6-pack"!

CAN I GENERATE "FREE ENERGY" IN MY CAR/TRUCK???

You can! But how? Miracles? No, no, no. You generate free energy by ENHANCING the EFFICIENCY of your poorly designed engine!!! Your engine uses 20% of the energy stored in that expensive fuel - and WASTES 80% for heat, pollution (unburned fuel!) and vibration. You reduce waste with our technology = "free energy" for you! There's more to it. Read on...
http://www.hydrowaterpower.com/hydrogen-faq.htm