Abstract: A fuel economizing and pollution reducing device for interposition between the conventional carburetor and intake manifold of an internal combustion engine. An exhaust gas heated exchange tube extends through the interior of the device, providing a constriction, or a reduction in the cross-sectional area, of the interior of the device. The fuel-air mixture entering from the carburetor is abruptly directed through this constriction by a deflection plate. Thus, the inducted mixture flowing past the heat exchange tube is subjected to an increase in both heat and velocity, producing improved atomization and vaporization of the fuel in the air. Beyond the heat exchange tube, a turbulent effect is created, promoting further vaporization of the fuel and intermixture of air therewith. In a preferred embodiment, these dual effects are enhanced by a mixing plate which is positioned downstream of the constriction.