TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The fuel composition (A) comprises: cetane improver (0.1-0.35 vol.%), preferably 2-ethylhexyl nitrate (0.3 vol.%); biodiesel blend comprising biodiesel (5 vol.%) and diesel (95 vol.%); antioxidant (400 mg/l of the biodiesel blend) comprising 2-tert-butyl-1,4-hydroquinone and a sterically hindered phenol, preferably Ethanox 4703 (RTM: 2,6-Di-tert-butyl-alpha-dimethylamino-para-cresol) or Ethanox 4733 (RTM: 2,6-Di-tert-butyl-phenol), where the volumetric ratio of 2-tert-butyl-1,4-hydroquinone to the sterically hindered phenol is 1:1. The fuel composition (A) further comprises a composition comprising aromatic amine antioxidant or a performance additive. Preferred Components: The cetane improver is 2-ethylhexyl nitrate ((preferred) which is present at 0.3 vol.%), cyclohexyl nitrate, di-tert-butyl peroxide, methyl nitrate, ethyl nitrate, n-propyl nitrate, isopropyl nitrate, allyl nitrate, n-butyl nitrate, isobutyl nitrate, sec-butyl nitrate, tert-butyl nitrate, n-amyl nitrate, isoamyl nitrate, 2-amyl nitrate, 3-amyl nitrate, tert-amyl nitrate, n-hexyl nitrate, 2-ethylhexyl nitrate, n-heptyl nitrate, sec-heptyl nitrate, n-octyl nitrate, sec-octyl nitrate, n-nonyl nitrate, n-decyl nitrate, n-dodecyl nitrate, cyclopentylnitrate, cyclohexylnitrate, methylcyclohexyl nitrate, isopropylcyclohexyl nitrate, 1-methoxypropyl-2-nitrate, 1-ethoxpropyl-2 nitrate, 1-isopropoxy-butyl nitrate and/or 1-ethoxybutyl nitrate. The fatty acid ester is rapeseed methyl ester, canola methyl ester, soybean methyl ester and/or maize oil methyl ester; and formed by transesterifying an alcohol with soybean oil, rapeseed oil, palm oil, canola oil, sunflower oil, olive oil, maize oil, coconut oil, jatropha oil, tallow oil, yellow grease animal fats and/or used cooking oil. The diphenol is: hydroquinone, tert-butylhydroquinone, 2-tert-butyl-1,4-hydroquinone, 2,5-di-tert-butyl-1,4-hydroquinone, methylhydroquinone and/or 2,5-di-tert-octylhydroquinone; and of formula (I). The sterically hindered phenol is: 2,6-di-tert-butylphenol, 2,4-di-tert-butylphenol, 2,6-di-tert-butyl-4-methylphenol, 2-tert-butylphenol, 2,4,6-tri-tert-butylphenol and/or 2,6-di-tert-butyl-4-dimethylaminomethylphenol; and of formula (II). In the biodiesel blend, the biodiesel is present at 5 vol.% and diesel is present at 95 vol.%R1, R3 = H or tert-butyl; andR2 = H, CH3, tert-butyl or -CH2-N(CH3)2. EXAMPLE - No suitable example given.