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This paper describes an innovative concept of using infrared (IR) excitation to help hydrocarbon fuels burn in internal combustion engines at a possible higher efficiency. In organic chemistry, hydrocarbons are known to be infrared-active and absorb photons in 3 - 20 μm wavelengths causing molecular vibrations that lower activation barrier and thus increase oxidation rate during combustion. As a result, IR-excited fuel becomes more combustible in engine, helping getting closer to the ideal of constant-volume combustion for higher cycle efficiency. Prototype IR-emitters were made from selective transition metal oxides with a spectral luminance in 3 - 16 μm wavelengths. The IR-excitation effect was demonstrated by testing at an engine lab of MTU (DaimlerChrysler Off-Highway) on its 8V4000M63 model heavy-duty diesel engine for marine applications, showing a 6% reduction in fuel consumption.