18 MPG combined isn’t going to win any fuel-sipping awards, but it accurately reflects what the 2018 Genesis G90 AWD 5.0L 8-cyl is about. This isn’t a car designed for hypermiling commuters. It’s a luxurious, spacious sedan built for executives and those accustomed to being driven, prioritizing comfort and power over outright efficiency.

City and highway performance

The EPA estimates the 2018 Genesis G90 5.0L AWD achieves 15 MPG in city driving and 23 MPG on the highway. These numbers are unsurprising given the G90’s considerable weight and the strong power output of its naturally aspirated 5.0-liter V8. City driving, with its stop-and-go traffic and frequent acceleration, is where the G90’s fuel efficiency suffers most. Conversely, the 23 MPG highway rating is a more respectable figure, reflecting the engine’s ability to cruise at lower RPMs on the open road. The 8-speed automatic transmission is also helping, keeping the engine in its sweet spot for efficiency whenever possible.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2018 Genesis G90 5.0L AWD at $3,200. This figure is based on driving 15,000 miles per year, with 55% of those miles driven in the city and 45% on the highway, using national average fuel prices. Potential G90 owners should carefully consider this cost, as it’s a significant recurring expense. This estimate will change based on local fuel prices and individual driving habits.

Real-world expectations

While the EPA figures offer a baseline, real-world MPG will vary depending on driving style, traffic conditions, and even the terrain. Drivers who accelerate quickly can expect fuel economy to dip below the EPA estimates, especially in city driving.

However, those who prioritize smooth acceleration and maintain consistent speeds on the highway may see slightly better numbers. Regular maintenance, including timely oil changes and tire inflation, is important for maintaining optimal fuel efficiency. Check G90 MPG across all years for more information.

How it compares

The G90 5.0L AWD faces stiff competition in the luxury sedan segment, and fuel economy is one area where alternatives may be different. For example, the BMW 750i xDrive, with its twin-turbo V8, achieves an EPA-estimated 17 MPG city and 25 MPG highway, bettering the G90 on the highway. The Lexus LS 500 AWD, with its twin-turbo V6, boasts 18 MPG city and 27 MPG highway, offering a noticeable improvement in fuel efficiency. The Mercedes-Benz S560 4MATIC (now discontinued after 2020), with its own twin-turbo V8, managed a slightly better 17 MPG city and 27 MPG highway rating. However, potential G90 buyers often prioritize value and spaciousness over fuel efficiency. The G90 offers a good alternative to established luxury brands, providing a similar level of features and refinement at a competitive price point.

For those looking for more efficient options within the Genesis lineup, you can find all Genesis fuel economy data on our site.

Tips to maximize efficiency

The Genesis G90’s throttle can be heavy, inviting you to dig deep into the V8’s power reserve. Practicing smooth, gentle acceleration, especially from a standstill, can significantly improve fuel economy, preventing the engine from working harder than necessary.

Maintaining proper tire inflation is critical. Underinflated tires increase rolling resistance, forcing the engine to work harder. Keeping your tires at the recommended pressure not only improves fuel economy but also extends tire life.

Avoid unnecessary idling. The G90’s V8 consumes a surprising amount of fuel while idling. If you anticipate being stopped for more than a minute, it’s generally more fuel-efficient to turn off the engine and restart it when you’re ready to go.

Use the G90’s driving modes. The Eco mode can adjust engine and transmission settings to prioritize fuel efficiency. While it might slightly reduce performance, it can make a noticeable difference in MPG, especially during city driving.

Remove excess weight. Carrying unnecessary items in the trunk or cabin adds weight to the vehicle, which in turn reduces fuel economy. Clean out any clutter to minimize the load the engine has to carry.