Magnets on fuel lines don't work to improve fuel economy, per Popular Mechanics magazine testing. The article is below -
Looking For A Miracle: We Test Automotive 'Fuel Savers'
http://www.popularmechanics.com/cars...ileage/1802932
Looking For A Miracle: We Test Automotive 'Fuel Savers'
http://www.popularmechanics.com/cars...ileage/1802932