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This paper presents the major results of an International Consortium study carried out by IFP and focused on the evaluation of fuel impacts on Controlled Auto Ignition (CAI) combustion. The formulation and tests of two adapted fuel matrix have allowed identifying and evaluating the main fuel properties that can improve CAI combustion for a maximum enlargement of the CAI operating range. CAI combustion mode appears as one promising solution for the development of low CO2 gasoline engines. Fuel properties can then be key parameters to improve the performances of CAI engines. During a first step of the study, steady state tests have been performed on a single cylinder Port Fuel Injection Spark Ignition (PFI SI) engine, with real fuels.