The 2020 Genesis G90 RWD with the 5.0L V8 gets 19 MPG combined. This number shouldn’t surprise or deter those considering the G90, since it’s a full-size luxury sedan prioritizing strong power, opulent comfort, and quiet isolation above all else. Fuel efficiency is simply not the primary concern for buyers drawn to this specific configuration of the G90.

City and highway performance

The EPA estimates 16 MPG in the city and 24 MPG on the highway for the G90 RWD 5.0L. A large-displacement V8 engine, even with modern technology, requires significant fuel to move a vehicle of this size and weight, especially during stop-and-go driving. The highway number is more respectable, as the eight-speed automatic transmission allows the engine to cruise at lower RPMs, but even here, aerodynamics and sheer mass play against ultimate efficiency.

Annual fuel cost

According to the EPA, the annual fuel cost for operating a 2020 Genesis G90 RWD 5.0L is $3,050. This figure is based on driving 15,000 miles per year and using the national average fuel price at the time of calculation. As fuel prices fluctuate, this number will vary, but it provides a standardized benchmark for comparing running costs with other vehicles. For G90 buyers, this expense is often a relatively small consideration within the broader context of vehicle ownership and running costs.

Real-world expectations

While the EPA provides standardized testing, real-world fuel economy can vary depending on driving style, traffic conditions, and even the season. Drivers with a heavier foot will likely see numbers below the EPA estimates, particularly in city driving. Conversely, those who prioritize smooth acceleration and anticipate traffic flow might achieve numbers closer to, or even slightly above, the highway rating. The 5.0L V8 encourages spirited driving, which inherently impacts fuel consumption. Factors such as tire pressure and regular maintenance also affect fuel economy. Check G90 MPG across all years.

How it compares

The G90’s fuel economy is as expected within its competitive set. The BMW 750i xDrive, with its 4.4L twin-turbo V8, achieves a similar 17 MPG city and 25 MPG highway. The Mercedes-Benz S560, also equipped with a V8, posts figures around 19 MPG combined. An Audi A8’s fuel economy will vary depending on engine and drivetrain, but will often meet or exceed the G90. These comparisons highlight that while there are more efficient luxury sedans available, such as those with smaller turbocharged engines or hybrid powertrains, the G90’s fuel consumption is typical for a V8-powered flagship sedan. If fuel efficiency is a top priority, buyers in this segment often consider models like the Lexus LS 500h hybrid, which delivers significantly better MPG, but at the cost of a different driving experience.

Tips to maximize efficiency

The G90’s driving mode selector includes an “Eco” mode that can improve fuel economy somewhat. Engaging this mode adjusts throttle response and transmission mapping to prioritize efficiency over performance. This won’t transform the G90 into a fuel sipper, but you’ll notice a slight improvement, especially during steady-state cruising.

Gentle acceleration and braking are important for saving fuel in any vehicle, and the G90 is no exception. Avoid abrupt starts and anticipate traffic flow to minimize unnecessary braking. The G90’s comfortable ride can mask speed, so use cruise control on the highway to maintain a constant speed and prevent unintended acceleration.

Regular tire pressure checks are critical, as underinflated tires increase rolling resistance and reduce fuel economy. Refer to the sticker on the driver’s side doorjamb for the recommended tire pressure for your G90 and ensure your tires are properly inflated, especially before long trips.

While premium fuel is recommended for optimal performance in the G90’s 5.0L V8, it’s not strictly required. However, using lower octane fuel may result in reduced power and potentially slightly lower fuel economy. Experiment to see if the cost savings of regular fuel outweigh any perceived compromises in performance.

Consider the weight you are carrying in the vehicle. Removing unnecessary items from the trunk and cabin can reduce the vehicle’s overall weight, which will incrementally improve fuel economy. This is especially relevant if you routinely carry heavy items that are not essential for your daily commute. You can find all Genesis fuel economy data here.