16 MPG combined. That number for the 2026 Audi RS Q8 Performance isn’t a surprise, it’s a statement. It declares, in no uncertain terms, that efficiency, while appreciated, is a distant secondary concern to the unadulterated, intoxicating performance this 4.0L twin-turbocharged V8 delivers. This isn’t a vehicle for those obsessed with mileage. It’s for the buyer who demands supercar-level acceleration and handling in an SUV body, someone who views fuel consumption as a necessary operational cost for unparalleled driving exhilaration. The RS Q8 Performance is a magnificent beast, genetically engineered for speed and a soundtrack that borders on symphonic, not for sips of petrol.

City and highway performance

Looking at the EPA figures: 14 MPG in the city and 20 MPG on the highway. These numbers are entirely predictable for a high-performance SUV packing a 4.0L twin-turbo eight-cylinder engine. In urban environments, where the RS Q8 Performance truly shines with its instant torque and responsive S8 automatic transmission, the constant acceleration, braking, and idling will inevitably keep the consumption on the higher side. The very nature of city driving, especially when the opportunity to unleash those hundreds of horsepower presents itself, is antithetical to fuel savings. On the open highway, where the mighty V8 can settle into a more relaxed cruise, maintaining a steady speed allows for a modest improvement to 20 MPG. This highway figure is respectable for its class, but it’s still far from what one might call “economical.” What is truly remarkable is the sheer breadth of performance available at any given moment, from a luxurious cruiser to a track-devouring machine, the powertrain is always ready, albeit thirsty.

Annual fuel cost

The EPA’s estimated annual fuel cost for the 2026 Audi RS Q8 Performance stands at precisely $3,600. This figure is calculated based on an average of 15,000 miles driven per year, assuming a mix of city and highway driving, and using national average fuel prices as of the EPA’s assessment. For the buyer of an Audi RS Q8 Performance, this $3,600 is another line item in the budget, not a deal-breaker. This isn’t a vehicle chosen for its economic operation, it’s chosen for its blistering 0-60 times, its commanding road presence, and its ability to transport a family at warp speed. Those who buy into the RS Q8 Performance ecosystem understand that the price of admission extends beyond the initial purchase, encompassing higher insurance, maintenance, and, yes, fuel costs. It’s an investment in a driving experience, and the fuel bill is simply part of that investment. For more information on all Audi fuel economy data, our site has extensive resources.

Real-world expectations

In the real world, owners of the 2026 Audi RS Q8 Performance should generally anticipate fuel economy figures that align closely with, or perhaps even fall slightly below, the EPA estimates. The temptation to exploit the 4.0L V8’s immense power and torque is nearly irresistible. Every on-ramp becomes a launch pad, every open stretch of road an invitation to explore the upper echelons of the speedometer. Such spirited driving, while utterly thrilling, will inevitably push consumption into the lower teens, often below the 14 MPG city rating. Conversely, a disciplined driver embarking on a long, steady highway cruise might occasionally see numbers nudging slightly above 20 MPG, but such restraint is rare in an RS model. The true “real world” for this vehicle involves frequent, enthusiastic use of its performance capabilities, meaning most owners will become intimately familiar with their local premium fuel stations.

How it compares

The 2026 Audi RS Q8 Performance operates in a rarefied atmosphere, where direct competitors also prioritize power over parsimony. Take the Porsche Cayenne Turbo GT, for instance, which often registers 15 MPG combined (14 city/19 highway) from its own 4.0L twin-turbo V8. The BMW X6 M Competition, with its 4.4L twin-turbo V8, typically sees combined figures of 15 MPG (13 city/18 highway). Even the larger Mercedes-AMG GLS 63, powered by a 4.0L biturbo V8, hovers around 16 MPG combined (14 city/18 highway). These comparisons are crucial because they demonstrate that the RS Q8 Performance’s 16 MPG combined is right in line with, if not marginally better than, its direct high-performance luxury SUV rivals. The buyer for these vehicles is cross-shopping performance first, badge prestige second, and fuel economy a very distant third. They accept that a 600+ horsepower SUV will be thirsty, and they are willing to pay for the privilege of experiencing such exhilarating power. For a broader view of RS MPG across all years, our archives provide comprehensive details.

Tips to maximize efficiency

While the primary mission of the RS Q8 Performance isn’t efficiency, there are still strategies to gently nudge its consumption figures in the right direction. Modulating throttle inputs, especially in city driving, makes a significant difference. Avoiding aggressive acceleration and abrupt braking cycles reduces the engine’s workload and, consequently, its fuel appetite.

Using the various drive modes effectively can also contribute. Engaging “Efficiency” or “Comfort” mode when performance isn’t important will typically soften throttle response and optimize transmission shift points for better economy, though the difference is marginal in a vehicle of this caliber.

Regular maintenance, including keeping tires properly inflated and ensuring engine air filters are clean, plays a foundational role in maintaining optimal efficiency. A well-maintained engine simply runs more efficiently than one that is neglected, regardless of its power output.

Minimizing unnecessary weight in the vehicle and opting for a smoother, more consistent driving style on the highway can have a slight positive impact. Avoiding rapid speed fluctuations forces the engine to work harder to regain momentum, which burns more fuel.

Finally, consider the use of the vehicle’s coasting functionality, often found within the efficiency drive modes. When lifting off the accelerator at speed, the vehicle can temporarily decouple the engine from the transmission, allowing it to coast more freely and conserve momentum, thus reducing fuel burn during deceleration phases.