magnets for better mileage ???

[BigAl]

I really don't know where is the best place to post this ,so here goes . Have any of you fellow members had any experience with these magnets that install on a automobile gas lines and are suppose to increase mileage up to 10 % ? I have seen these things advertised for years in J.C. Whitney and Harbor Frieght . It seems to me that if these things really worked everyone would own one or want one on there car or truck . I wonder if these things are like a bucket of Prop Wash or chrome muffler bearings !!! Can someone set me straight here . With the price of gas going higher and higher , I would love to find a way to get better fuel economy . I keep my truck tuned up ,proper air in the tires , and all the other standard things a person does to get the best out of their vehicle . Thanks for any and all input .
Al

 

[plumboy]

Look at it this way,any of the auto makers with all their R&D would jump on it if it would help,one selling point for them is mpg.Dont waste yur money.