TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The composition (I) is a gasoline composition having an initial boiling point of 15-70 degrees C (as determined by IP123), a final boiling point of at most 230 degrees C (as determined by IP123), a research octane number (RON) of 85-110 (as determined by ASTM D2699) and a motor octane number (MON) of 75-100 (as determined by ASTM D2700). The composition (I) further comprises: a conventional fuel component; at least one fuel additive(s) comprising antioxidants, corrosion inhibitors, detergents, dehazers, antiknock additives, metal deactivators, valve-seat recession protectant compounds, dyes, friction modifiers, lubricity improvers, carrier fluids, diluents or markers; a Fisher-Tropsch fuel component; and a phenolic antioxidant, which comprises phenol and/or at least one alkyl-substituted phenol, which is present at 0.02-100 wt.% of bio-carbon. Preferred Components: The 4-8C olefins were obtained from or derived from a light cat-cracked gasoline fraction. In the composition (I), more than 50 vol.% of the 4-8C olefins are branched olefins. The biofuel component is at least partly produced by contacting a biomass material with a catalytic cracking catalyst at a temperature of more than 400 degrees C in a catalytic cracking reactor. The 4-8C olefins comprise normal olefins and branched olefins, where the volume ratio of normal olefins to the branched olefins is preferably less than or equal to 1:1. Preferred Process: In the process: the obtained fraction is a light cat-cracked gasoline fraction of which at least 80 wt.% boils at greater than or equal to 35 degrees C to less than 125 degrees C under a pressure of 1 bar absolute (0.1 MPa); the light cat-cracked gasoline fraction comprises 1-60 vol.% of 4-8C olefins, based on the total volume of the light cat-cracked gasoline fraction, and 0.02-100 wt.% of bio-carbon, based on the total weight of carbon present in the light-cat-cracked gasoline fraction. EXAMPLE - No suitable example given.