To reduce the CO₂ emission level for the new CAFE regulations, a series of measures are implemented by the manufacturers. Besides the use of hybrid and electric vehicles, efficiencies packages are frequently applied to improve to reduce CO₂ emissions of conventional vehicles. Efficiencies packages implement: Start&Stop, Coasting, eco tyre, powertrain thermal management and aerodynamic kits. Usually, they are optimized for the WTLC cycle. The aim of this paper is to assess the influence of this packages in real-world driving cycles. The study is done by means of modelling and simulation, using an industrial modelling and simulation environment (LMS Imagine.Lab AMESim). Two passenger cars from different classes, one being a compact type and another a SUV are used. The results of this paper are further compared with the results obtained for the same packages in the WLTC cycle.