[CivicSpoon]

This was posted the other day, think it was the tech forum; looks like the poster deleted it. But it some member of the board said he was going to try it out and post results about it. If I remember correctly it costs $300+ and saves around 18-25% on gas consumption. It also cleans up the carbon deposits in your engine, so you have to change your oil frequently. And you stick in ON TO your gas tank, not in it. Could work, doubt it, but it could.