26 MPG combined makes the 2025 Volvo S90 B6 AWD a quietly competent luxury sedan, delivering efficiency that punches above its class considering its standard all-wheel-drive and focus on quiet, effortless performance. This isn’t a vehicle chasing headline-grabbing horsepower figures or aggressive cornering dynamics, but rather one designed for individuals who appreciate understated elegance, exceptional safety, and a refined driving experience. For them, 26 MPG is achieved through Volvo’s engineering, integrating mild-hybrid technology to provide respectable economy in a substantial, comfortable executive sedan, allowing them to traverse their daily commutes and longer journeys without undue concern for frequent fuel stops.

City and highway performance

Looking into the S90 B6 AWD’s EPA ratings reveals a 23 MPG figure for city driving and an impressive 31 MPG on the highway. The city number, while not groundbreaking for a sedan, is solid for a vehicle of this size and weight, particularly with permanent all-wheel drive and a strong 2.0L four-cylinder engine working hard in stop-and-go conditions. Volvo’s mild-hybrid system plays a crucial role here, smoothly assisting the engine during acceleration from a standstill and recovering energy during deceleration, mitigating some of the fuel penalty inherent in city traffic. On the open road, the S90 truly stretches its legs. The 31 MPG highway rating is excellent for its segment, showcasing the efficiency of the 8-speed automatic transmission and the engine’s ability to cruise effortlessly at highway speeds. This reflects Volvo’s optimization for long-distance comfort, where the S90 spends much of its time, carrying executives to meetings or families on extended trips.

Annual fuel cost

The EPA estimates an annual fuel cost of $2,250 for the 2025 Volvo S90 B6 AWD. This figure is calculated based on an assumption of 15,000 miles driven per year, split roughly 45% city and 55% highway, using national average fuel prices. For a prospective S90 owner, this $2,250 annual expense is a manageable component of luxury vehicle ownership. It represents a predictable operating cost that aligns with the premium nature of the car without being exorbitant. Those who purchase the S90 are typically not primarily focused on minimizing fuel expenditure above all else; rather, they seek a holistic package of safety, comfort, technology, and design. The S90’s annual fuel cost provides a clear, transparent baseline, allowing owners to budget effectively while enjoying the capabilities of their vehicle. This figure reassures them that their choice for a safe, elegant, and powerful sedan doesn’t come with an unexpectedly high recurring fuel bill.

Real-world expectations

In real-world driving, owners of the S90 B6 AWD can generally expect to meet or slightly exceed the EPA’s combined 26 MPG, provided their driving habits are relatively consistent and they maintain their vehicle properly. The S90’s mild-hybrid system is genuinely effective in improving everyday efficiency, particularly in mixed driving conditions where the engine isn’t constantly under heavy load. Drivers who frequently find themselves on highways will likely see figures closer to the 31 MPG highway rating, especially when cruising at moderate speeds with adaptive cruise control engaged. Conversely, aggressive driving, frequent short trips in dense urban environments, or consistently hauling heavy loads will naturally push the numbers closer to, or slightly below, the 23 MPG city rating. The S90’s character, however, naturally encourages a smoother, more deliberate driving style, which inherently contributes to better fuel economy. It’s a car that rewards a relaxed pace, fitting perfectly with its mission of delivering quiet luxury.

How it compares

The 2025 Volvo S90 B6 AWD holds its own remarkably well against its direct German and Asian luxury sedan competitors when it comes to fuel economy. Let’s consider a few key rivals. The Audi A6 45 TFSI quattro, also powered by a 2.0L turbocharged four-cylinder with AWD, typically achieves around 26 MPG combined (23 city/31 highway), placing it directly in line with the S90. Many buyers of both vehicles are prioritizing features and brand loyalty, knowing fuel economy is virtually identical. The BMW 530i xDrive, another prominent competitor with a 2.0L turbo-four and AWD, usually delivers a slightly better 27 MPG combined (23 city/33 highway). While a small difference, some efficiency-conscious luxury buyers might note this. However, the S90’s unique Scandinavian design and unparalleled safety reputation often outweigh this marginal MPG difference for its target audience. Moving to the Lexus ES 350, a front-wheel-drive only model with a naturally aspirated V6, it typically manages 22 MPG combined (22 city/31 highway), demonstrating the S90’s 2.0L turbo-four’s advantage despite the Volvo’s standard AWD. The Mercedes-Benz E 350 4MATIC, with its 2.0L turbo-four and AWD, also comes in around 26 MPG combined (23 city/30 highway), making it another direct peer. For the buyer focused on refined comfort, advanced safety, and distinctive design, the S90 B6 AWD’s fuel economy is entirely competitive within a segment where luxury and performance often take precedence over bare-bones efficiency figures. More data on other Volvo models can be found by exploring all Volvo fuel economy data on FuelEconomyHub.com, or for specific model information, see S90 MPG across all years.

Tips to maximize efficiency

To get the most out of your S90 B6 AWD’s fuel economy, consider adopting a smoother driving style. The car’s mild-hybrid system excels when accelerations are gradual and consistent, allowing the electric motor to assist more effectively and reduce the strain on the gasoline engine.

Regular maintenance is important for sustaining optimal fuel economy. Ensure your S90 receives its scheduled services, including oil changes and air filter replacements, as a well-tuned engine operates more efficiently and keeps the turbocharged engine with electric motor running as designed.

Pay close attention to your tire pressure. Correctly inflated tires minimize rolling resistance, a simple yet highly effective way to improve fuel efficiency that is often overlooked. Check your S90’s recommended pressures and monitor them monthly.

Use the S90’s advanced cruise control systems, particularly adaptive cruise control, on highway stretches. These systems are designed to maintain a consistent speed and safe following distance more efficiently than most human drivers, leading to smoother operation and better mileage.

Minimize unnecessary weight in your trunk and avoid prolonged idling. While the S90 is a substantial vehicle, even small changes in load and eliminating excessive idling can contribute to noticeable improvements in your overall fuel economy over time, especially in city driving scenarios.