According to many sites, water 4 gas is the most comprehensive course on the internet on how to run your car on water. I would agree with this. However, one of the main problems with it is that it is really hard to understand. Sure, the information is accurate, but you need to have some technical knowledge to figure it out. A much cleaner, easier to use and cheaper guide is Water Car Pro, which is getting some press now. The disadvantage of Water Car Pro is that it doesn’t contain as many bonuses and is shorter. But in some ways this can be a good thing as it means it will take you less time to go through.