One gasoline saving idea that has been circulating on the internet is using hydrogen gas (H2) as an alternative fuel source for cars. The idea has created a lot of excitement because many car owners are searching for ways to reduce their gasoline expense bill. Due to rising global crude oil prices, gasoline prices around the country have reached a new height. It is understandable that people are hungry for information that can help them to cut cost. How does the concept of using hydrogen gas for cars works? This article will reveal the secret behind this new technology.