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Mercedes-AMG branches out with a four-seat grand tourer with bruising performance

The GT 4-Door’s interior is, in fairly large part, what you’ll find in a generously equipped version of the Mercedes-Benz CLS, but for a raised centre console and some detail and trim differences.

The door panels arch elegantly inwards to meet a dashboard dotted with Mercedes’ hallmark turbine air vents, and behind the busy spokes of a new multi-function steering wheel sits a 12.3in digital instrument binnacle ‘dual bonded’ to another, more central display of identical size. AMG might have done more to distance its latest ware from that of other Mercedes and AMG models, but the overall effect is convincing: sumptuously old world in part but simultaneously very cutting edge.

Secondary displays next to switches mean you only take your eyes off the road once when changing settings, rather than looking first for the button and then somewhere else to check you’ve achieved what you intended

Less convincing is the fascia on the transmission tunnel, which is one of the few interior elements bespoke to the four-door GT. It’s inspired by the GT two-seater’s centre console and features the same embossed gearlever, but it seems a touch ugly and quite space-inefficient. There’s a broader point here: that while material quality is mostly excellent and the nappa leather conspicuously soft, switchgear remains an area in which Mercedes still trails the likes of Porsche and Bentley, whose fitments feel more robust and have a more tangible sense of perceived quality.

This is the new era of Mercedes, with a brace of 12.3in displays that sweep across the dashboard as part of a single unit. These are conspicuously slick displays, with graphics of unrivalled sharpness and a depth of colour rarely seen elsewhere.

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Each can show a range of data pertaining to navigation, media, telephone and the trip computer, although the one that replaces the traditional instrument binnacle can switch through three styles of gauges (Classic, Sport and Supersport). There’s also the facility to bring up dials displaying real-time torque and power outputs, as well as boost pressure and g-force.

Commands are given by either of the two thumb pads on the steering wheel or via a trackpad on the transmission tunnel. Although they’re mostly fine, neither worked quite as seamlessly as we would have liked, with the trackpad at times eliciting frustrating lags. A software update could be required.

In the rear of the cabin, Mercedes’ steeply raked roofline eats into head room for taller passengers a little, although leg room is generous and the seats themselves comfortable. To accommodate three abreast, you’ll need to tick an option box, because as standard the GT63 comes without a central berth – or the ability to fold the asymmetric seatbacks down and increase the capacity of the car’s 461-litre boot.

The boot itself is an adequately commodious space big enough to carry four good-sized duffel bags, although a Panamera Sport Turismo would carry five and an BMW M5 saloon perhaps six. As with all fastbacks, the opening is uniformly broad, although the lip is also stubbornly deep.