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Four family cars are evaluated for their fuel consumption and carbon dioxide (CO2) emission: a petrol Peugeot 1.6l 307, diesel Peugeot 1.6l 307, hybrid Toyota Prius II and LPG Seat Leon 1.6l. They are subjected to 4 driving styles: new (environment friendly), relaxed, normal and aggressive. Each driving style is tested on three road types: urban, rural and motorway. Consumption+CO2 is highest on urban roads for all driving styles except for the Toyota Prius where this is only valid for the aggressive style; it is lowest on rural roads except for aggressive driving that is lowest on motorway for the Peugeot 307 petrol and diesel. Aggressive driving results in a significant increase of consumption+CO2 on urban (max. of 68% from the Peugeot petrol car) and rural roads (max. of 47% from the Peugeot diesel car). The lowest increase is for the Seat Leon LPG (9% urban and 19% rural) together with the Prius (18% rural).