TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The gas oil composition comprises (vol.%) gas oil (75-99.9, preferably 85-98); and dialkyl carbonate (0.1-25, preferably 2-15). The composition comprises additives ( not greater than 0.3 vol.%) such as flow improvers, lubricity improvers, cetane improvers, antifoam agents, detergents, antioxidants, anticorrosion agents, antistatic agents or dyes. Preferred Method: The dialkyl carbonate is obtained by reaction of urea with at least one bioalcohol, in the presence of at least one catalyst. The dialkyl carbonate is obtained by a first step in which at least one alkylene glycol is reacted with urea, in the presence of metal oxides as catalysts, in order to obtain alkylene carbonate and a second step in which the alkylene carbonate is subjected to a transesterification reaction with at least one bioalcohol, in order to obtain dialkyl carbonate and alkylene glycol, the alkylene glycol being recycled to the first reaction step. The dialkyl carbonate is obtained by oxidative carbonylation of at least one bioalcohol with carbon monoxide and oxygen, in the presence of at least one catalyst. The bioalcohol is obtained by the fermentation of at least one biomass deriving from agricultural cultivations rich in carbohydrates and sugars such as corn, sorghum, barley, beet and/or sugar cane. The bioalcohol is obtained by the fermentation of at least one lignocellulosic biomass which can be selected from: products of crops expressly cultivated for energy use (such as miscanthus, foxtail millet, switchgrass, common cane), including waste products, residues and scraps of the crops or their processing; products of agricultural cultivations, forestation and silviculture, comprising wood, plants, residues and waste products of agricultural processing, of forestation and of silviculture; waste of agro-food products destined for human feeding or zootechnics; residues, not chemically treated, of the paper industry; and/or waste products coming from the differentiated collection of solid urban waste (such as urban waste of a vegetable origin, paper). The bioalcohol is obtained by the fermentation of at least one algal biomass cultivated for energy purposes, or by the fermentation of residues or derivatives from the cultivation of the algal biomass. The dialkyl carbonate is obtained by transesterification of at least one dialkyl carbonate, or of at least one cyclic carbonate, with at least one bioalcohol, in the presence of at least one catalyst. Preferred Components: The dialkyl carbonate is selected from dialkyl carbonate of formula RO-C(=O)-OR1 (preferably diethyl carbonate, di-n-butyl carbonate, di-isobutyl carbonate, 1-butanol, 3-methyl carbonate (di-isoamyl carbonate), 1-butanol and/or 2-methyl carbonate, especially diethyl carbonate and/or di-n-butyl carbonate). The bioalcohol is selected from bioalcohol of formula R2-OH (II) (preferably bioethanol, bio-n-butanol, bio-isobutanol, bio-3-methyl-1-butanol and/or bio-2-methyl-1-butanol (preferably bioethanol and/or bio-n-butanol)).R and R1=linear or branched 1-12C (preferably 2-8C) alkyl;R2=linear or branched 1-12C (preferably 2-8C) alkyl. EXAMPLE - A gas oil containing diethyl carbonate (purity 99.5%) was prepared which showed density at 15 degrees C of 830 kg/m3 according to EN ISO 12185:1996/01:2001, flash point of 93 degrees C according to EN ISO 2719:2002, and cetane number of 58 according to EN ISO 5165:1998.