Mercedes-Benz has finally revealed the standard V177 A-Class Sedan, three months after the company debuted the long-wheelbase Z177 for China. As you’d expect, it’s exactly like the W177 hatchback, albeit with a separate boot to cater to more sedan-friendly markets like ours and the United States.

As was revealed last week, the four-door holds the record for the lowest aerodynamic drag coefficient on a production vehicle at 0.22, a figure shared with the outgoing CLA. That’s partly due to the fact that the frontal area is even smaller than the CLA’s, at 2.19 square metres. By comparison, the still-slippery hatch has a drag coefficient of 0.25.

Measures to reduce drag include extensive sealing (such as around the headlights), an almost flat underbody, an optional grille shutter and front and rear wheel spoilers that deflect air around the wheels. The wheels and tyres themselves have also been aerodynamically optimised.

Design-wise, the sedan retains the hatch’s low shark nose front end, featuring tapered headlights (with optional Multibeam LED technology) and a trapezoidal grille with a dinner plate-sized three-pointed star. Also retained is the strong shoulder line, simple upswept character line lower down and a sweeping glasshouse, made all the more cohesive thanks to a shorter wheelbase than the slightly awkward LWB version.

The rear is as we’ve seen on the A-Class L Sedan, with angular two-piece tail lights that decorate the short tail, emphasising the car’s width. As usual, there’s a range of wheels on offer, measuring between 16 and 19 inches in diameter, and there will also be an Edition 1 with copper highlights inside and out.

Inside, the cabin will again be familiar to hatch owners, with a thoroughly modern design carrying Stuttgart’s latest design language. That means that the wing-shaped dashboard is dominated by a large freestanding display panel – here without an upper cowl, like on the hatch – and round turbine-style air vents. There’s also a 64-colour ambient lighting system with 10 colour themes, or “worlds.”

Available in either seven- or 10.25-inch sizes, the twin instrument and infotainment displays – the latter is now available as a touchscreen – utilise the new Mercedes-Benz User Experience (MBUX) interface, with features such as augmented reality overlays for the navigation display and a voice control system with natural speech recognition, operated using the phrase “Hey Mercedes.”

The system also uses artificial intelligence and will be able to learn your preferences in time. Other features that make their debut on MBUX include navigation functions using vehicle-to-vehicle and vehicle-to-infrastructure communication, parking and fuel price information and a vehicle tracking feature that can notify you if a parked car has been crashed into or towed away.

The A-Class Sedan measures 4,549 mm long, 1,796 mm wide and 1,446 mm wide, making it 130 mm longer and six millimetres taller than the hatch, all while keeping its 2,729 mm wheelbase. Mercedes claims that the sedan offers class-leading rear headroom and above-average shoulder and elbow room, while its 420 litre boot is 50 litres more than its five-door sibling.

At launch, only the A 200 petrol and A 180 d diesel will be offered. The former utilises an M282 1.33 litre turbocharged four-cylinder mill, developed in partnership with Renault and producing 163 hp and 250 Nm of torque, while the oil burner utilises Mercedes’ own OM608 1.5 litre turbodiesel churning out 116 hp and 260 Nm. Both are mated to a seven-speed dual-clutch transmission (7G-DCT), now made by Getrag.

Both models come as standard with torsion beam rear suspension, with variants equipped with more powerful engines or the 4Matic all-wheel drive system – which we presume will be announced later on – will get a four-link rear axle. A MacPherson strut front setup is standard on all models.

Safety-wise, the A-Class Sedan comes as standard with Active Brake Assist (autonomous emergency braking) and Active Lane Keeping Assist, and can be specced with Distronic adaptive cruise control, Active Emergency Stop Assist and Active Lane Change Assist. There’s also an optional Pre-Safe system as well as Pre-Safe Rear that detects an imminent rear-end collision and applies the brakes to reduce its severity.

Production of the A-Class Sedan will kick off this year in Aguascalientes, Mexico in a plant shared with the Renault-Nissan-Mitsubishi Alliance, while the Rastatt facility in Germany – which already builds the hatch version – will join the fray next year.