TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The composition (C1) (vol/vol.%) comprises DT-CNSL (4.5, 5, 10, 15, 20, preferably 10); diesel (95.5, 95, 90, 85, 80, preferably 5) and kerosene (95, 90, 85, preferably 85) and optionally plant oils (4-29) or fuel additive(s) (0.01-5, preferably 0.01-1 wt.%).The DT-CNSL comprises cardanol (75-99.98) along with cardol or methyl cardol (0.01-12.5 each).The diesel and kerosene are in a ratio of 9.5:0.5-0.5:9.5.Preferred Component: The fuel additive(s) is selected from anti-polymerizing agents, anti-knocking agents anti-freezing agents, anti-coagulation agents, anti-precipitation agents, cetane index boosters and/or cetane number boosters (preferably anti-polymerizing agents selected from triphenyl phosphite, trinonyl phenyl phosphite, diisodecyl phenyl phosphite, diphenylisooctyl phosphite, diphenylisodecyl phosphite, tricresyl phosphate, cresyl diphenyl phosphate, dinitrophenol, hydroquinone, p-cresol, dinitro-p-cresol, hydroquinone methyl ester, polyhydroquinone and/or poly- alpha -naphthol).The plant oil is selected from rapeseed oil, palm oil, castor oil, sunflower oil, safflower oil, hemp oil, mustard oil, soybean oil, jatropha oil, radish oil, canola oil, corn oil, rice bran oil, peanut oil, cottonseed oil, coconut oil, neem seed oil and/or tung oil.The plant oils are used as their methyl esters.Preferred Process: The DT-CNSL is obtained by subjecting technical cashew nut shell liquid to distillation under reduced pressure (1-15 mm Hg) at 225-275 degrees C or atmospheric pressure at 360 degrees C.The composition (C1) is further stored in a dry place at -10-55 degrees C.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The DT-CNSL further comprises polymeric material ( less than or equal to 5 vol/vol.%). EXAMPLE - A biofuel composition (test) comprised diesel (80%), methyl ester of jatropa seed oil (15%) and distilled technical cashew nut shell liquid (CNSL) (5%). The engine run time for test/diesel was 26/25 minutes, thus test showed better engine performance when compared to diesel alone.