I find all these kind of things to be snake oil with bogus claims of improved gas mileage. If this stuff really worked I'm sure the government would be forcing oil companies to formulate their gas with it in and available to all.
Isn't it interesting that this is the same web address (savegastoday.net) that has the other bogus hydrogen contraption for sale. You know the one where the guy uses 3 cheap glass jars. then there's the other one with one cheap glass jar and a sponge. Who knows what that one did???