The present invention is made in a well-applied in a mixed state to natural radium ore (1) the aluminum foil (2) and fuel economy improvement sheet (A) was added to the aqueous solution to the natural radium ore to fine powder, and the thus made fuel efficiency sheet by attaching the (a) on both sides of the copper plate (3) to produce a fuel economy improving sheet (B). To do this, the prepared fuel efficiency sheet (A) an air cleaner box (4E) When installing the attachment therein, or, fuel efficiency sheet (B) directly to the pleated portion of an air cleaner (4A), which is semi-permanently emitted from the fuel economy improving sheet α-ray, β-ray, causing the ionization chamber (1) and where (2) the of the intake-air oxygen molecules and other atoms, molecules, by γ-ray and ionization is promoted, with the same amount of air internal combustion engine is to burn completely increase the concentration of oxygen in the air required. As a result, it is more complete combustion at low temperature of the combustion chamber or the idle state, thereby improving fuel efficiency.; Note 1: the electrical ionizer, ... is given energy from the β-ray, γ-ray in a neutral atom phenomenon that orbit the electrons are released as free electrons ionize Gala; Note 2: Here, ... does not reach the ionization α ray, β-ray, γ-ray energy from a given result, a phenomenon in which the electron orbit unstable trajectory moving to the outside away from the nucleus, and then the trajectory of the electrons back to the original trajectory back to the moment the phenomenon where the energy is emitted as an X-ray when
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