16 MPG combined is what buyers of the 2026 Mercedes-Benz SL680 Maybach expect, a figure that is less a deterrent and more a reflection of the uncompromising power and luxury this hyper-exclusive roadster delivers. This isn’t a vehicle purchased for its parsimonious fuel consumption, but rather for the visceral thrill of its twin-turbocharged 4.0-liter V8, the unparalleled comfort of its Maybach-appointed cabin, and the undeniable statement it makes. The SL680 Maybach represents the pinnacle of open-air Grand Touring, a machine engineered to provide effortless, opulent performance, and its fuel economy reflects the sheer indulgence inherent in its design and mission. When one invests in an ultimate status symbol, the cost of fuel becomes a secondary consideration, absorbed into the broader experience of Maybach ownership.

City and Highway Performance

Looking closer into the EPA estimates, the 2026 Mercedes-Benz SL680 Maybach sees 13 MPG in city driving conditions. This figure is entirely predictable given the vehicle’s strong 4.0-liter 8-cylinder engine, designed for potent acceleration and commanding presence, not feather-footed urban efficiency. In stop-and-go traffic, the weighty chassis and powerful V8 are continuously cycling, consuming fuel to propel what is, by any measure, a substantial convertible. It&#8217s a trade-off owners readily accept, understanding that the intoxicating sound of the V8 at low speeds and the immediate torque delivery are integral to the SL680 Maybach experience.

On the open road, the SL680 Maybach improves to a more accommodating 20 MPG highway. Here, the 9-speed automatic transmission truly shines, smoothly shifting into higher gears to keep the engine RPMs low and efficient at cruising speeds. Long-distance journeys, where this vehicle is engineered to excel, allow the powertrain to operate closer to its most efficient point. For the individual who regularly travels between their palatial residences, enjoying the wind-in-hair exhilaration and uninterrupted opulence, 20 MPG on the highway is a perfectly acceptable figure. It&#8217s a vehicle built for effortless continent-crossing, where the journey itself is as significant as the destination, and maintaining momentum with a powerful V8 is important to that experience.

Annual Fuel Cost

The EPA estimates an annual fuel cost of $3,600 for the 2026 Mercedes-Benz SL680 Maybach. This calculation is based on the industry-standard assumption of driving 15,000 miles per year, split between city and highway driving, using an averaged national fuel price. This figure, while substantial in isolation, is a negligible operational expense for the typical SL680 Maybach owner. When considering the seven-figure price tag of the vehicle itself, the cost of its specialized maintenance, and the luxury lifestyle it facilitates, $3,600 for fuel annually is simply part of doing business. Owners of such a vehicle are not scrutinizing every dollar spent at the pump; convenience, performance, and prestige far outweigh fuel economy concerns. This figure represents the cost of unfettered performance and unparalleled luxury on a yearly basis, a cost willingly borne by those fortunate enough to acquire this magnificent machine.

Real-World Expectations

In the real world, owners of the 2026 Mercedes-Benz SL680 Maybach can expect its fuel economy to hover very close to the official EPA estimates, particularly given its advanced powertrain management. However, for a vehicle designed to evoke exhilaration, spirited driving is not uncommon. Frequent hard acceleration, a common indulgence with a 600+ horsepower twin-turbo V8, will naturally push fuel consumption towards the lower end of the spectrum, possibly even slightly below the 13 MPG city rating. Conversely, long, unhurried highway cruises with the top down and the massage seats activated might marginally exceed the 20 MPG highway rating. The character of this vehicle encourages engagement, and engaging with its immense power will logically consume more fuel. The SL680 Maybach is not driven with efficiency in mind; it is driven for the sheer joy and effortless performance it offers, and its real-world fuel consumption reflects that priority.

How It Compares

When placed in context, the 2026 Mercedes-Benz SL680 Maybach&#8217s 16 MPG combined is not an anomaly among its ultra-luxury, high-performance peers. Consider its closest competitors. The Bentley Continental GT Convertible with its 4.0L V8, itself a powerful and luxurious grand tourer, achieves an EPA combined rating of 18 MPG (15 City/24 Highway). While slightly better on paper, the difference is marginal and unlikely to sway a buyer deciding between these two titans of luxury. The Aston Martin DBS Volante, another prestigious open-top, equipped with a 5.2L V12, delivers an even lower 14 MPG combined (12 City/17 Highway), highlighting that increased displacement and cylinder count directly impact efficiency. Even high-performance variants of the Porsche 911 Turbo Cabriolet, while smaller and lighter, typically land around 19 MPG combined (17 City/23 Highway), proving that once horsepower figures climb past a certain point, diminishing returns on fuel economy become inevitable. Ultimately, the SL680 Maybach’s fuel economy falls perfectly in line with competitors aimed at a clientele who prioritize power, prestige, and unparalleled luxury over fuel efficiency metrics. For an extensive look at SL680 MPG across all years, consult our archives.

Tips to Maximize Efficiency

While fuel efficiency isn&#8217t a primary concern for SL680 Maybach owners, adopting certain driving habits can still optimize range and contribute to smoother operation. Gentle acceleration and anticipation of traffic flow help the 9-speed automatic transmission work more efficiently, keeping the powerful V8 within its economical operating range more often.

Regularly checking tire pressure ensures optimal rolling resistance, which can have a subtle but cumulatively beneficial effect on fuel consumption. The vehicle&#8217s advanced monitoring systems make this an effortless task, and proper inflation also enhances handling and tire longevity.

Using the vehicle&#8217s &#8220Comfort&#8221 or &#8220Eco&#8221 driving modes, when appropriate, can subtly adjust throttle response, transmission shift points, and even HVAC settings to prioritize smoother, more fuel-conscious operation without sacrificing the inherent luxury experience.

For those embarking on longer journeys, packing efficiently and avoiding unnecessary weight in the trunk or cabin can incrementally reduce the load on the engine, contributing to marginally better fuel economy for sustained cruising.

Adhering strictly to the recommended maintenance schedule, especially for oil changes and air filter replacements, ensures the 4.0-liter V8 operates at its peak efficiency. A well-maintained engine is innately a more efficient engine, regardless of its power output. Explore all Mercedes Benz fuel economy data for more insights.