17 MPG combined isn’t going to win any fuel efficiency awards, but for the 2023 Mercedes-Benz AMG GT 63 S 4matic Plus, a snarling, technologically advanced, all-wheel-drive, four-door coupe packing a hand-built 4.0L twin-turbo V8, it’s almost beside the point. This isn’t a Prius and it’s not trying to be. The buyers of this vehicle are purchasing a visceral experience, an intoxicating blend of power, luxury, and exclusivity. Fuel economy is a secondary consideration, a price they’re willing to pay for the privilege of unleashing 630 horsepower on demand.

City and highway performance

The EPA estimates for the AMG GT 63 S break down to 15 MPG in the city and 21 MPG on the highway. The city figure reflects the stop-and-go driving conditions where that potent V8 is constantly straining against the leash, its turbos spooling and unspooling. Highway performance, while not stellar, is a bit better, showcasing the benefits of the smooth-shifting 9-speed automatic transmission and the engine’s ability to cruise at lower RPMs when the hammer isn’t constantly dropped. Of course, these numbers are theoretical, achieved under carefully controlled testing conditions. Real-world driving habits will significantly impact the MPG you actually see.

Annual fuel cost

The EPA calculates that owning and driving this beast will cost you approximately $3,400 per year in fuel costs. This figure is based on driving 15,000 miles annually, using national average fuel prices. The AMG GT 63 S requires premium fuel, so fluctuations in premium fuel prices will directly affect this number. Keep in mind that aggressive driving, frequent use of launch control, and a heavy foot in general will only increase this cost.

Real-world expectations

Realistic fuel economy for the AMG GT 63 S 4matic Plus is likely to fall slightly below the EPA estimates, especially if you enjoy exploring the upper ranges of the tachometer. Expect city driving to hover around 12-14 MPG and highway runs to yield something in the 18-20 MPG range. However, consistent highway driving with a very light foot could get you close the sticker’s 21 MPG number.

Your personal driving style, the terrain you typically traverse, and even the weather conditions can all impact your fuel consumption. The AMG GT 63 S’s all-wheel drive system, while providing incredible grip and stability, also adds weight and complexity, slightly hindering fuel economy compared to a rear-wheel drive counterpart.

How it compares

Compared to its rivals, the AMG GT 63 S finds itself in a predictably thirsty category. The Porsche Panamera Turbo S E-Hybrid boasts a higher combined MPG of 22 MPG thanks to its plug-in hybrid system, but it also has more complexity and added weight. The BMW M8 Competition Gran Coupe offers similar performance and fuel economy at around 17 MPG combined, appealing to a similar buyer. Even the Audi RS7, which is rated at 18 MPG combined, only offers a marginal improvement, and none of these minor differences are likely to sway a purchase decision. Owners are buying the specific driving dynamics, badge appeal, and the overall emotional connection they have with each brand.

Tips to maximize efficiency

While fuel economy might not be your primary concern, there are ways to squeeze a few more miles out of each gallon in your AMG GT 63 S. Given its considerable horsepower and torque, smooth and progressive acceleration will help minimize fuel consumption. Avoid abrupt acceleration and hard braking, as these driving habits drastically reduce efficiency.

Take advantage of the car’s drive modes. The “Comfort” setting, while slightly taming the engine’s response, will optimize the transmission for fuel-efficient cruising. This will promote earlier upshifts and keep the engine operating in a more efficient range. It won’t turn the AMG GT 63 S into an economy car, but it can make a noticeable difference over time, particularly on long drives.

Properly inflated tires are critical for maximizing fuel efficiency. Check your tire pressures regularly to ensure they are at the recommended levels. Underinflated tires create more rolling resistance, forcing the engine to work harder and consume more fuel. This is particularly important on a heavy car like this with performance tires designed for grip rather than low rolling resistance.

Reduce unnecessary weight in the vehicle. Extra cargo adds to the overall load, requiring more energy to accelerate and maintain speed. Remove any items you don’t need, particularly heavy objects, to improve your fuel economy.

Finally, consider using the cruise control on long highway journeys. Maintaining a steady speed helps minimize fuel consumption by avoiding constant fluctuations in throttle input. This is especially beneficial in areas with relatively flat terrain. Remember to check all Mercedes Benz fuel economy data and maybe compare with AMG MPG across all years for more insights.