In recent years, it has been expected the conversion of wasted biomass to industry available energy. In this study, 80 wt.% of wood and 20 wt.% of polypropylene were liquefied by the mineral oil used as solvent. The liquefied material was distilled, and distillation fraction of temperature from 493 to 573 K was recognized as light oil fraction CLF (Cellulose Liquefaction Fuel) and that from 378 to 493 K was recognized as naphtha fraction CLF. CLFs were blended with light oil and, in engine performance test, mixing ratio of light oil fraction CLF was 5 wt.%, and in vehicle running test, weight mixing ratios were 5 or 10 wt.%. In engine performance test, indicator diagrams and rate of heat releases of light oil fraction CLF 5 wt.% mixed light oil were almost equivalent to those of light oil in all load conditions, and engine performance and exhaust gas emissions were also almost equivalent to light oil. Therefore, the light oil fraction CLF 5 wt.% mixed light oil had almost no influence on combustion and engine performance. In vehicle running test, fuel economy of light oil fraction CLF 5 wt.% mixed light oil was almost equal to that of light oil, however THC and CO concentrations of CLF mixed fuel were worsen and were increased as engine revolution increased. The acceleration performance of light oil and naphtha fraction CLFs 5wt.% mixed light oil were almost the same as light oil. Therefore, light oil fraction CLF 5 wt.% mixed light oil can be practically used as alternative fuel.