The 2021 Audi RS Q8 offers 15 MPG combined. It’s not a vehicle prized for its fuel efficiency, but for performance, luxury, and power. The RS Q8 is built for drivers who want strong power and don’t mind the fuel bill. The ideal buyer is a successful professional, entrepreneur, or someone who prioritizes driving pleasure. They want a vehicle that dominates on the road, and they’re willing to pay for it.

City and highway performance

EPA estimates put the RS Q8 at 13 MPG in the city and 19 MPG on the highway. The city figure highlights the RS Q8’s weight and the inefficient nature of stop-and-go traffic, requiring constant management of the 591 horsepower engine. The highway number reflects the aerodynamic challenges of an SUV combined with the power of the twin-turbo V8. Even with the cylinder deactivation system trying to save fuel at cruising speeds, the engine’s thirst is apparent.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2021 Audi RS Q8 at approximately $3,850, based on driving 15,000 miles per year, with 55% in the city and 45% on the highway, using premium gasoline. Individual spending will depend on driving and fuel prices, but $3,850 is a realistic estimate to consider with the vehicle’s price and running costs.

Real-world expectations

Achieving 19 MPG consistently on the highway is unlikely without hypermiling. Real-world driving, with acceleration, cornering, and traffic, will likely produce figures closer to the combined 15 MPG, or even lower. The result of all that power and handling is going to be dismal MPG. Remember the reason for buying this vehicle: it’s not about the MPG. Those who want to save fuel should compare all Audi fuel economy data before deciding.

How it compares

The RS Q8 exists in a segment where power overshadows fuel efficiency. The BMW X6 M, with its twin-turbo V8, has EPA figures of 13 MPG city and 18 MPG highway, nearly identical to the RS Q8. The Mercedes-AMG GLE 63 S Coupe achieves a slightly better 15 MPG city and 19 MPG highway. Even the Lamborghini Urus, sharing its platform with the RS Q8, achieves EPA ratings of 14 MPG city and 19 MPG highway. These comparisons show that the RS Q8’s fuel consumption is normal for this class of SUVs. To look broadly across the RS lineup, you might review RS MPG across all years.

Tips to maximize efficiency

Avoid using the full engine power constantly. The RS Q8’s twin-turbo V8 is strong, but full-throttle driving burns fuel. Gentle acceleration and a steady pace, especially on the highway, will help. Use the Audi Drive Select system and choose the “Efficiency” mode when possible. This mode adjusts engine and transmission settings for improved fuel economy, but reduces powertrain responsiveness.

Monitor your tire pressures. Underinflated tires increase rolling resistance and reduce fuel efficiency. Check the recommended tire pressure in the owner’s manual or on the driver’s side doorjamb and ensure proper inflation. Low-profile tires that help this vehicle perform are not designed for optimal comfort or efficiency on normal roads.

Minimize idling. Letting the engine idle consumes fuel without moving. If you’re stopped for more than a minute or two, turn off the engine. The RS Q8’s quick restart system makes restarting easy. Limit remote start use to warming (or cooling) the vehicle before driving, not for extended idling.

Use cruise control on the highway. Maintaining a consistent speed helps fuel efficiency. Cruise control minimizes acceleration and deceleration, helping mileage. This feature enables less aggressive driving, improving MPG.