An automobile fuel saver is composed of a container, a magnetic block, a plurality of nano far-infrared pellets and a cover, wherein the container is configured with an opening that enables a magnetic block and a plurality of the nano far-infrared pellets to be disposed into the container therethrough, and the cover is used to cover and seal the opening. Such a configuration enables a user to use connecting rods to respectively screw into screw holes defined in the cover to juxtapose and assemble a plurality of the fuel savers. The assembled composite structure of the fuel savers is disposed into a fuel tank to effectively improve automobile performance, decrease fuel consumption, and reduce exhaust discharge while simultaneously increasing horsepower and torsion.