19 MPG combined is not the primary concern of the typical 2023 Mercedes-Benz S580 4matic buyer. Performance, luxury, technology, and status are important; fuel efficiency plays a supporting role at best for those seeking one of the world’s finest sedans. This isn’t to say fuel economy is irrelevant, but to contextualize expectations for a vehicle with a twin-turbocharged 4.0-liter V8 engine and a curb weight exceeding 4,800 pounds.

City and highway performance

The S580 4matic’s EPA ratings break down to 16 MPG in the city and 25 MPG on the highway. The city figure reflects the reality of stop-and-go driving, where the engine’s displacement and turbocharging work harder to overcome inertia. Highway figures are more palatable, proving that the 9-speed automatic transmission can use its wide gear ratio spread to maximize efficiency at cruising speeds. Keep in mind that aggressive driving will reduce these numbers dramatically; a gentle foot yields the best results, even with the S580’s ample power reserves.

Annual fuel cost

The EPA estimates an annual fuel cost of $3,050 for the 2023 Mercedes-Benz S580 4matic. This figure is calculated based on driving 15,000 miles per year, with 55% of those miles driven in the city and 45% on the highway, using national average fuel prices. Individual spending will vary based on local fuel costs and driving habits. Drivers who primarily use their S580 for short city trips may exceed this estimate; those who primarily use it for long highway cruises may spend less. These figures are based on premium fuel, which the S580 requires.

Real-world expectations

While the EPA provides a standardized baseline, real-world fuel economy often deviates. S580 drivers should lower their expectations, as achieving the official numbers requires conscious effort. Aggressive acceleration to exploit the V8’s 496 horsepower will inevitably harm efficiency. Driving style, traffic conditions, weather, and even tire pressure can influence fuel consumption. That said, consistently achieving 20-22 MPG in mixed driving is attainable for those who prioritize efficiency. Some drivers report even higher numbers under ideal conditions, while others may struggle to break 18 MPG.

It’s a V8-powered luxury sedan, so enjoy responsibly and be keenly aware that fuel efficiency is directly linked to driving style.

How it compares

The S580’s fuel economy positions it predictably within its class. The BMW 760i xDrive, also equipped with a turbocharged V8 and all-wheel drive, achieves similar figures, rated at 18 MPG combined. The Audi S8, another powerful V8-powered sedan, mirrors the S580’s 19 MPG combined. Alternatives using hybridized powertrains, like the plug-in hybrid BMW 750e xDrive, offer significantly better efficiency, but they generally lack the pure performance feel that many S580 buyers desire. For those who prefer electric vehicles, the all-electric Cadillac LYRIQ offers an alternative with no fuel consumption. Comparing the S580’s MPG figures to vehicles outside its class is pointless; its buyers are comfortable with the inherent trade-offs. Shoppers interested in seeing S580 MPG across all years can review that data easily.

Tips to maximize efficiency

Use the S580 4matic’s “Comfort” driving mode whenever possible. This mode prioritizes fuel efficiency through optimized throttle response and transmission mapping. Selecting “Sport” or “Sport+” modes will deliver more immediate power, but at the expense of fuel economy. These modes are best reserved for situations where maximum performance is needed.

Ensure that your tires are properly inflated to the recommended pressure listed on the doorjamb placard. Underinflated tires increase rolling resistance, forcing the engine to work harder and reducing fuel economy. Regular tire pressure checks are a simple but effective way to conserve fuel.

Practice smooth and gradual acceleration. Avoid abrupt starts and stops, as these actions consume excessive fuel. Anticipate traffic flow and maintain a consistent speed whenever possible. The S580’s abundant torque allows for effortless acceleration, even when driven gently.

Minimize idling. Modern engines consume fuel even when stationary. If you anticipate being stopped for more than a minute or two, turn off the engine. The S580’s start-stop system helps with this, but only in certain driving conditions. Take extra care in warmer weather to mitigate heat soak if you are routinely activating start-stop.

Schedule regular maintenance to keep the engine running efficiently. Clean air filters, properly functioning spark plugs, and regular oil changes ensure optimal combustion and reduce fuel consumption. Consult your owner’s manual for recommended maintenance intervals. Always prioritize getting your service completed by a qualified Mercedes-Benz technician. If you are curious about all Mercedes Benz fuel economy data, you can find more information online.