18 MPG combined is a reality check for buyers of the 2018 Genesis G80 AWD with the 5.0L V8. No one shopping for this particular configuration of the G80 expects Prius-like efficiency, but even among luxury sedans offering similar power and all-wheel drive, that number is low. This car exists for a specific buyer: someone who wants a comfortable, stylish, and powerful luxury car without the badge snobbery (or price tag) of its German rivals. Fuel economy is less important than the growl of the V8 and the confident feeling of all-wheel traction.

City and highway performance

The EPA estimates 15 MPG in the city and 23 MPG on the highway. That spread reveals the G80 5.0’s weakness: stop-and-go driving. The aging eight-cylinder engine needs to work hard to move the nearly 4,600-pound sedan from a standstill, and that translates directly into fuel consumption. On the open road, where the engine can settle into a relaxed cruise in its top gear, fuel consumption improves drastically. Highway driving showcases the G80 5.0’s strengths: a comfortable ride, effortless passing power, and the ability to eat up miles without fatigue. It’s a highway cruiser at heart, even if its city fuel economy suffers.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2018 Genesis G80 AWD 5.0L at $3,200. This figure is based on driving 15,000 miles per year, split approximately 55% city and 45% highway, and using the national average fuel price for regular unleaded gasoline at the time of testing. It’s a useful benchmark for comparing fuel costs between vehicles, but individual costs will vary depending on driving habits and local fuel prices. A driver who spends most of their time in congested city traffic will likely exceed that $3,200 estimate, while someone who primarily uses the G80 for long highway trips might see slightly better results. If you’re concerned about fuel costs, take a moment to compare the all Genesis fuel economy data to help put your mind at ease.

Real-world expectations

Don’t expect to consistently match the EPA’s numbers, especially in real-world conditions. Aggressive driving, heavy traffic, and even weather conditions can all negatively impact fuel economy. Owners report figures ranging from the low teens in city driving to around 25 MPG on long highway trips. The key is to drive smoothly and avoid unnecessary acceleration. Owners looking for a more eco-friendly G80 should consdier exploring G80 MPG across all years to compare models.

How it compares

Compared to its rivals, the 2018 Genesis G80 5.0 AWD is thirstier. A similar-vintage BMW 540i xDrive, with its turbocharged inline-six, achieves a combined EPA rating of 23 MPG. The Mercedes-Benz E450 4MATIC, another popular choice in this segment, achieves an EPA combined rating of 24 MPG. Even the V6-powered Audi A6 Quattro manages around 25 MPG combined. However, many of these competitors come at a higher price point, and none offer the combination of V8 rumble and all-wheel drive grip for the G80 5.0’s price. This isn’t about outright efficiency, it’s about value and a specific driving experience.

Tips to maximize efficiency

The Genesis G80 5.0L has a lot of power on tap, but using it all the time will destroy your fuel economy. Drive smoothly, anticipate traffic flow, and avoid sudden acceleration whenever possible. Let the car’s torque do the work when merging or passing, instead of mashing the throttle.

Take advantage of the G80’s various drive modes. The “Eco” mode dulls throttle response and optimizes the transmission for fuel efficiency. While it might not be the most engaging experience, it can make a noticeable difference in city driving.

Regular maintenance is critical for optimal fuel economy. Ensure the tires are properly inflated, the engine air filter is clean, and the spark plugs are in good condition. A well-maintained engine runs more efficiently.

Reduce unnecessary weight in the vehicle. Extra cargo in the trunk or backseat adds to the car’s overall weight, forcing the engine to work harder and consume more fuel. Empty the car of anything you don’t absolutely need.

Plan your routes strategically. Avoid congested areas and look for routes with fewer stop-and-go situations. Even a slightly longer route with consistent speeds can be more fuel-efficient than a shorter route with heavy traffic.