Water4Gas is the best water gas conversion product out there.  It was written by a man named Ozzie Freedom.In his Water4Gas book, Ozzie will show you all the steps you need to take to begin getting 80% better gas mileage.  Ozzie leaves absolutely nothing out.  This is what makes his product better than the rest of the similar products on the market, combined with the fact that his method gets the best fuel mileage of all.The book is $97, not cheap, but you could save that much money on gas in a week if you follow his instructions step by step.