Using water as a fuel was in first cars so its really old thing. But with todays technology they built the better way to use it as a fuel and replace it on any cars. Its surely a good idea and if you calculate the fuel cost the price of this product is not much. Only it depends on how long km can drive one tank.
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It depends on weight of vehicle so they don't mention that. For normal car you may go nearly 200 miles, I think