Mercedes-AMG GT 4-door Coupe
"The Mercedes-AMG GT 4-door Coupe offers genuine sports-car handling and performance in a four-door package that belies its size and weight in corners"
- Sharp handling
- Huge performance
- Useable four-seat layout
- Expensive to buy
- High emissions and road tax
- No six-cylinder engine confirmed
The Mercedes-AMG GT 4-door Coupe is a direct rival for the Porsche Panamera and BMW M8 Gran Coupe that offers a blend of performance and luxury similar to that of the original two-door Mercedes-AMG GT, albeit with an extra pair of doors and a wider choice of engines.
Based loosely on the Mercedes E-Class, but with significant bodywork and mechanical upgrades, the GT 4-door Coupe comes with a choice of two V8 petrol engines for now, with the arrival of a six-cylinder possible but unconfirmed for a later date. All models come with Mercedes' 4MATIC four-wheel drive and nine-speed automatic gearbox as standard.
Developed entirely by AMG (rather than being a tuned version of a standard Mercedes model), the GT 4-door Coupe is agile, fast and remarkably engaging. In top-spec 63 S form, the car is particularly ferocious and is the most powerful car that AMG produces: 0-62mph takes just 3.2 seconds and a top speed of 196mph is possible where the law (or a large abandoned airfield) allows.
While capable, the GT suffers as most large, fast luxury cars do with fuel economy, CO2 emissions and pricing – it’s not a cheap car to run or buy, especially in its fastest configuration. However, if you have the means, few cars of this sort come as close to offering a genuine sports-car feel in a luxurious package.
MPG, running costs & CO2
The currently confirmed engine range for the Mercedes-AMG GT 4-door Coupe consists of two 4.0-litre twin-turbocharged V8 petrol engines, so fuel economy and CO2 emissions are unimpressive in isolation, but about average for the class. Both the GT 63 and more powerful GT 63 S return around 22mpg, with CO2 emissions of 256-257g/km. This puts it in the highest year-one road-tax band, which means a payment of £2,070 - however, this is usual factored into the on-the-road price.
All GT 4-door Coupe models are set to cost more than £40,000, so a £310 surcharge is added to the standard £140 yearly rate in years two to five of ownership. Those high CO2 figures mean the highest BiK rate of 37% applies to company-car users. The GT 4-Door benefits from the same servicing packages and three-year/unlimited-mileage warranty as other Mercedes cars, with a fixed-price servicing package costing around £50 per month.
Engines, drive & performance
Although the GT 4-door Coupe was revealed with a pair of mild-hybrid six-cylinder petrol engines, the only two options currently confirmed for UK sale are the more powerful twin-turbocharged 4.0-litre V8 petrols, putting distance between this model and the less powerful Mercedes CLS. The Mercedes-AMG GT 63 gets a 585bhp version of the engine, while the GT 63 S has 639bhp, making it the most powerful car that AMG has produced.
Both cars come with 4MATIC four-wheel drive, with the 63 S boasting a high-performance version of the system that allows for a ‘drift mode’ – a way for experienced drivers to enjoy the car’s power in controlled environments by overcoming the tyres’ grip. The system sends most of the engine’s power to the rear wheels, with the front wheels coming into play when more traction is required.
A range of selectable driving modes are offered, including Comfort, Sport, Sport+, Slippery and Individual, plus RACE mode in the GT 63 S. These are supplemented by AMG Dynamics, a system that can track the car’s behaviour and adjust the way it drives accordingly by adjusting areas like the car’s four-wheel steering, engine and suspension.
Those who've driven the Mercedes-AMG E63 saloon will be familiar with the general big-engined, muscle-car-like feeling that the most powerful GT 63 S gives on the road. The 4-door Coupe shares much of the character of the smaller Mercedes-AMG GT coupe, too: its steering, while slightly less sensitive, is just as direct and accurate, while the large amounts of grip and four-wheel steering help make high-speed cornering a fun experience. And while straight-line performance is remarkable, the car’s brakes are just as impressive.
Interior & comfort
The Mercedes-AMG GT 4-door Coupe isn't quite as driver-focused inside as its two-door siblings, feeling more akin to modern Mercedes saloons such as the Mercedes CLS and Mercedes S-Class. The dashboard flows across the width of the car, with turbine-style air vents in polished metal set into attractive decorative trim.
Wood and carbon-fibre are among the trim options, with leather upholstery for the standard sports seats that can be specified in a quilted finish. We'd prefer a sportier driving position to reflect the car’s AMG heritage, but otherwise the 4-door Coupe has an interior worthy of its price tag.
Mercedes’ excellent dual-screen infotainment display features, with two 12.3-inch screens. The screen on the right sits behind the AMG steering wheel and can be set up to show a range of driving information displays, while the central screen combines displays for infotainment, car settings and connectivity, including Apple CarPlay and Android Auto. It’s frustrating that the new console design has seen the usual rotary controller swapped for a touchpad that's far trickier to use.
When not being driven in its angriest settings, the GT 4-door Coupe does a good job of feeling like a luxurious Mercedes saloon – refined, smooth-riding (although with a firmer, sportier edge) and quiet at speed.
Practicality & boot space
As it’s based on the same underpinnings as the Mercedes E-Class and CLS, the AMG GT 4-Door is relatively practical for a car of its type. There’s space in the rear for two adults to sit comfortably, as in a Porsche Panamera, but you have to specify a third rear seat if you plan to travel five-up. Headroom is hampered by the car’s dramatic roofline, although legroom is perfectly acceptable for a car of this type.
There’s a large boot under the similarly large hatchback bootlid, measuring in at 456 litres – slightly less than the Porsche Panamera’s 495 litres. If you need to carry large loads while enjoying the thrust of an AMG V8 engine, the Mercedes-AMG E 63 estate is a better bet, thanks to its 640-litre load bay (expandable to a colossal 1,820 litres with the rear bench folded).
Reliability & safety
The Mercedes-AMG GT 4-door Coupe hasn't been crash-tested by Euro NCAP and as such doesn't have an official safety rating. However, Mercedes’ great track record in this department – and the car’s hi-tech, safety-conscious construction – should mean occupants are well protected in the event of a collision.
The usual array of modern Mercedes active safety and driver-assistance features can be found on the GT 4-door Coupe – in fact, Mercedes claims that all of the ‘Intelligent Drive’ functions found in the Mercedes-AMG S-Class are featured on the GT, including active cruise control, active brake assist and active blind-spot assist.
Reliability is as-yet untested, but Mercedes’ 20th-place finish in our Driver Power 2018 survey should bring some comfort to potential owners. Around 12% of Mercedes owners we surveyed reported an issue with their cars, while most praised their vehicles’ interior comfort, practicality and ride and handling. Build quality and styling were rated higher still, with the brand achieving a 15th-place finish in these areas.
Price, value for money & options
For now, there are just two models to choose from: the GT 63 and the GT 63 S. Both come very well equipped, with a twin-screen infotainment system, a full complement of connectivity options including Apple CarPlay and Android Auto, LED headlights and AMG sports seats plus leather upholstery. Both cars also get 4MATIC four-wheel drive and AMG RIDE CONTROL suspension as standard, along with active rear-wheel steering and a full complement of driving modes, with the top-spec 63 S boasting the added ‘RACE’ setting with associated ‘drift’ mode.
The optional Aerodynamics Package adds a range of larger spitters, inlets and diffusers to the car’s bodywork, with a rigid rear spoiler replacing the standard fold-out version. All models are available with a choice of alloy wheels ranging from 19 to 21 inches.
With the GT 63 costing £120,000 and the 63 S around £135,000, they meet the Porsche Panamera Turbo and Turbo S E-Hybrid models head-on in the £120,000-140,000 range.