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The gasoline-air mixture added with a certain amout of hydrogen used as an engine fuel can extend the ignition limits, increase the rate of flame propagation and accelerate the combustion rate of the lean mixture; so that the fuel economy and emission characteristics of the engine are both improved herewith. The testing results of a single cylinder engine and a four cylinder automotive engine using such kind of dual fuel to improve their thermal efficiencies and fuel economy as well as to decrease their exhaust emissions are described in this paper.