From October 2008, the standard equipment of the 61 hp and 71 hp gas powered smart fortwo models will include micro hybrid drive (mhd) technology with a user-friendly automatic start-stop system. This reduces the consumption of the two naturally aspirated engines by an average of 8%. In city traffic fuel savings of almost 20% are even possible. Furthermore, from the autumn of 2008 the smart fortwo cdi will be equipped with a closed diesel particulate filter that almost completely eradicates particulate emissions.