TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The liquid hydrocarbon feed is light naphtha, heavy naphtha, gasoline, kerosene, vis-broken gasoline, cat. cracked spirit, coker gasoline, light cycle oil, naphtha from a catalytic cracking process, or a selectively hydrotreated naphtha.It further comprises sulfur-containing impurities, at least a portion of which are alkylated during the alkylation step.It further comprises aromatic compounds, which are alkylated in the alkylation step.Preferred Method: More than 30%, more preferably more than 50%, and most preferably more than 90% of the sulfur-containing species are alkylated during the alkylation step.A lower boiling fraction comprising hydrocarbons and a reduced concentration of sulfur-containing impurities and/or aromatic compounds is recovered from the alkylation step as the fuel composition.The lower boiling point fraction is recovered by distillation.The method further comprises introducing additive(s) to the hydrocarbon fuel composition, before the hydrocarbon fuel composition is converted to hydrogen. Preferred Properties: The lower boiling fraction has a final boiling point of less than 215degrees C, more preferably less than 180degrees C, e.g. 100-175degrees C.The hydrocarbon fuel composition recovered from the alkylation step has an olefin content of less than 40 wt.%, preferably less than 30 wt.%, more preferably less than 20 wt.%, and most preferably less than 10 wt.%; an aromatics content of less than 35 wt.%, preferably less than 25 wt.% and more preferably, less than 5 wt.%; a final boiling point (fbp) of less than 215degreesC, more preferably less than 180degrees C, e.g. 100-175degrees C; and a sulfur content of less than 60 ppm, preferably less than 10 ppm, more preferably less than 5 ppm, most preferably less than 2 ppm.The hydrocarbon fuel composition has a motor octane number (MON) of at least 80, and a research octane number (RON) of at least 90, preferably a MON of at least 85, and a RON of least 95. EXAMPLE - A sample of light catalytically cracked naphtha was alkylated, acid washed, and fractionated by distillation to yield a low sulfur (S), reduced aromatics and olefins fuel. An alkylated product having a boiling point of less than 100degrees C contained paraffins (48 wt.%), naphthenes (11.8 wt.%), olefins (34.4 wt.%), cyclo-olefins (1.7 wt.%), aromatics (4.1 wt.%), mercaptan S (6 ppm wt. S), thiophenic S (16 ppm wt. S), and sulfide S (6 ppm wt. S). It was tested as hydrocarbon fuel in an automated reformer consisting of quartz reactor. Fuel, water and air were supplied to the reactor as a gaseous reactant stream under a gas hourly space velocity (GHSV) of 19000/hour, a nominal oxygen to carbon molar ratio (O/C) of 0.9 and with a nominal steam to carbon molar ratio (S/C) of 0.5. At the end of the experiment, hydrogen (H2) production was 19.3 g/100g feed.