The 2009 BMW 323i, part of the E90 3 Series generation, offers a blend of luxury, comfort, and performance, Engine: The 323i is powered by a 2.5-liter inline-six engine producing approximately 149 kW (203 hp) and 244 Nm of torque. Acceleration: The 323i accelerates from 0 to 100 km/h in about 7.4 seconds. Fuel Economy: Owners report fuel consumption figures ranging from 8.3 to 9.2 L/100 km, with urban driving tending to be less efficient.