21 MPG combined for the 2025 Genesis G90 AWD 3.5L 6-cyl places it squarely within the expectations for a full-size luxury sedan. This is not a vehicle designed to break efficiency records, nor do its prospective owners typically obsess over fractional MPG differences. This is a car about refinement, isolation, and effortless power delivery, all attributes that inherently carry a certain fuel consumption overhead. The G90 exists as a statement of arrival; its fuel economy reflects the strong engineering required to deliver that premium experience in a segment dominated by established European and Japanese players. For the executive who prioritizes opulent comfort, advanced technology, and distinctive style, the G90’s efficiency figures are a reasonable trade-off for the car’s feature set.

City and highway performance

In the city, the G90 AWD 3.5L 6-cyl achieves 18 MPG. On the highway, it gets 26 MPG. The city figure, at 18 MPG, isn’t particularly surprising for a large all-wheel-drive sedan weighing in around 4,800 pounds. Stop-and-go traffic, the demands of accelerating from lights, and the constant micro-adjustments inherent in urban environments naturally consume more fuel. However, the highway figure of 26 MPG speaks to the inherent efficiency of the 3.5-liter twin-turbocharged V6 once it settles into a steady cruise. Genesis has paired this engine with an 8-speed automatic transmission, which allows the G90 to glide effortlessly on open roads, keeping engine RPMs low and maximizing efficiency when not under heavy acceleration. This disparity between city and highway underscores that the G90 is most at home devouring long stretches of asphalt, where its inherent comfort and composure shine, and its fuel consumption becomes less of a factor.

Annual fuel cost

The EPA estimates an annual fuel cost of $2,750 for the 2025 Genesis G90 AWD 3.5L 6-cyl. This figure is calculated based on an average driving distance of 15,000 miles per year and national average fuel prices, providing a standardized benchmark for consumers. For the typical G90 buyer, this annual outlay is generally viewed as a modest operational expense within the broader context of owning a premium luxury vehicle. These individuals are accustomed to the higher costs associated with luxury vehicle ownership, from advanced maintenance to premium insurance. The $2,750 figure, while not insignificant in absolute terms, aligns with expectations for a vehicle of this class and performance. This figure is rarely a decisive factor in the purchase decision for someone seeking the G90’s particular brand of sophistication and comfort.

Real-world expectations

In real-world driving, owners of the 2025 Genesis G90 AWD 3.5L 6-cyl can reasonably expect to achieve figures very close to the EPA estimates. Genesis powertrains are generally well-calibrated, and their engine management systems are designed to deliver consistent performance and efficiency. Drivers who spend a disproportionate amount of time in heavy urban congestion will undoubtedly experience figures closer to or slightly below the 18 MPG city rating. Conversely, those who primarily use the G90 for highway commuting or long-distance travel will find the 26 MPG highway figure quite attainable, if not occasionally exceeded under ideal conditions. Aggressive driving, with frequent hard accelerations and braking, will, as with any vehicle, significantly impact fuel economy. However, the G90’s character, which encourages a more quiet and composed driving style, naturally leads many drivers to operate it in a manner conducive to achieving its rated efficiency. Learn more about all Genesis fuel economy data.

How it compares

When placed alongside its primary competitors, the 2025 Genesis G90 AWD 3.5L 6-cyl holds its own, though it isn’t a class leader in efficiency. The Mercedes-Benz S 500 4MATIC, for instance, equipped with its 3.0L inline-six turbo engine, achieves a similar 21 MPG combined (19 city/28 highway). The BMW 740i xDrive, also sporting a 3.0L inline-six, nets an identical 21 MPG combined (20 city/27 highway). One exception is the Lexus LS 500, with its 3.4L twin-turbo V6, which comes in slightly lower at 22 MPG combined (19 city/29 highway). However, the Mercedes-Benz S 580e plug-in hybrid offers a class-leading electric range and a significantly higher combined MPGe. The G90 buyer is not typically cross-shopping against dedicated hybrids or electric vehicles for maximum efficiency. Instead, they are looking for a luxury experience. The G90’s efficiency is competitive enough, ensuring it doesn’t stand out as a gas guzzler in a segment where performance and luxury take precedence over absolute fuel economy. The Genesis offers a distinct blend of Korean luxury, a value that often outshines its German counterparts, and an engaging driving experience for such a substantial vehicle.

Tips to maximize efficiency

Maintaining consistent tire pressure is critical. Under-inflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel, while proper inflation ensures optimal contact with the road and improves stability, especially at highway speeds.

Adopting a smooth driving style will yield noticeable fuel savings. Avoiding rapid acceleration and hard braking helps the twin-turbo 3.5L V6 operate more efficiently, as the engine doesn’t need to overcome sudden load changes, particularly beneficial in city driving where the G90’s heavier curb weight is more evident.

Use the G90’s drive modes judiciously. While Sport mode is tempting, “Comfort” or “Eco” modes often recalibrate throttle response and transmission shift points, encouraging more economical operation without significantly sacrificing the vehicle’s refined character.

Consider the benefits of ‘hypermiling’ techniques, such as anticipating traffic lights, coasting to a stop, and minimizing idle time. Even short periods of idling contribute to unnecessary fuel consumption and emissions, especially in a vehicle with a larger displacement engine like the G90’s.

Regular maintenance, as outlined in the G90’s owner’s manual, is important. Fresh engine oil, clean air filters, and properly functioning spark plugs all ensure the engine runs at peak efficiency. Addressing any maintenance alerts promptly prevents small issues from escalating into performance and efficiency detractors. Explore G90 MPG across all years for detailed comparisons.