For any of these miracle gas economizers just ask yourself, "If this thing is this good why isn't it on new cars?" With all the pressure car companies have on them for fuel economy you can bet your bippy that they would use them.
The reason they can sell them is that there is a new sucker coming up every day.
cujo8 may have gotten 18% improvement but all we have is a posting on the internet, not always the best information available. If he actually got that kind of improvement there is no way to know for sure that the tornado was the cause, it could have been lots of things.
These types of things have been around for at least 60 years that I know of and will probably always be around because there is no law against them.
The magnets that "line up the fuel molecules" are even more of a scam.
One of the favorite stories of years ago was "Detroit and the Oil companies tried to keep this off the market and threatened us with lawsuits".
Keep this in mind, if it sounds too good to be true it probably is!