"We've tested every product that combines gas and water, and Water4Gas is the best - AdviceForSavingGas.com • Water4Gas Home Page • Features • FAQ

The HalfWaterHalfGas system gives very good instructions on how to install the product.  It has good diagrams and pictures, and also gives you bonuses.

The price for HalfWaterHalfGas is $67, though they claim that will go up.  That remains to be seen, so if you're waiting to buy, be forewarned that it could cost $97 in the future.

Half Water Half Gas is a great product, but I would recommend Water4Gas first because it gives you more improvement in mileage. With Half WaterHalfGas you save 60% on gas.  That's a fantastic rate, but Water4Gas is even better, at 80%

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