Liquid fuel and liquid fuel additive that reduce harmful substances such as particulate matter and carbon monoxide in the combustion gas of a liquid fuel combustion device such as an automobile without using a special device. The liquid fuel additive of the present invention is a powder or particulate tourmaline, a fluid such as a liquid in which tourmaline is dispersed in a colloidal form, or a liquid having a tourmaline partly dispersed in a colloidal form and the remainder in a fine particle state At least one of the fluids. A fuel with 0.002 grams of this liquid fuel additive added per liter of diesel oil was tested on a diesel engine vehicle. The emission of particulate matter was reduced by 16% and the emission of carbon monoxide was reduced by 10%. Maximum shaft torque increased by 2.0-3.7%.
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