The A4 represents the core of the brand – after four years in the making, Audi has made the successful midsize model even tauter and sportier. Its exterior is integrated into the brand’s new design language; the large MMI touch display offers the kind of operating experience customers will be familiar with from their smartphone. Many engine options now come with mild-hybrid systems (MHEV) – efficiency and comfort benefit from this broad-based electrification. This also applies to the Audi S4 TDI (combined fuel consumption 6.3 – 6.2 l/100 km (37.3 - 37.9 US mpg)*; combined CO2 emissions 166 – 163 g/km (267.2 – 262.3 g/mi)*, with a V6 TDI under the hood for the first time, a 48-volt main electrical system and an electric powered compressor (EPC), which lends its beefy acceleration even more spontaneity. This combination of power, torque and efficiency makes it unique in the segment.