I must admit that magnets increased mileage in my car too (Opel Astra G 1.4) for about 7%, even though I wrote in previous post that in most cases they don't give a result.
And some usefull information to everyone who likes to try magnets for mpg gain absolutely FOR FREE! I you guys have a damaged old hard disk, you can take the permanent magnets from it, following the instructions of the video
These magnets are much stronger than those from market. So using 2 tight ups, you can adapt these magnets easily and try them for mpg gain..I used 2 of this kind of magnets in my Astra for mpg gain