The EPA officially rates the 2018 Genesis G90 RWD with the 5.0-liter V8 at 19 MPG combined. It’s not designed for maximum gas mileage. The G90 buyer wants a spacious, opulent sedan with a reliable engine and a smooth ride. Fuel economy is a consideration, but comfort, prestige, and value are more important. This is a car for the executive who prioritizes rear-seat legroom and effortless acceleration over squeezing every last mile from a gallon of premium fuel.

City and highway performance

The EPA estimates the G90 V8 achieves 16 MPG in the city and 24 MPG on the highway. The city figure reflects stop-and-go traffic, where the G90’s weight and eight-cylinder engine aren’t efficient. However, the highway number is more respectable. At cruising speeds, the eight-speed automatic transmission can settle into a relaxed gear. The engine’s ample torque means less frequent downshifts, contributing to better fuel efficiency. Drivers will see the best highway MPG on long, flat stretches with minimal traffic.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2018 Genesis G90 5.0L RWD is $3,050. This is based on driving 15,000 miles per year and using the national average fuel price for premium gasoline. This is just an estimate. Your actual fuel costs will vary depending on your driving habits, the price of gas, and how often you drive.

Real-world expectations

While the EPA estimates offer a baseline, actual fuel economy often differs. Factors like driving style, traffic, and even tire pressure can change your MPG. Hard acceleration and frequent hard braking will reduce fuel economy. Regular maintenance, including keeping tires properly inflated, is important for optimal efficiency. Owners report figures close to the EPA estimates, but those with a heavy foot or who primarily drive in congested urban areas should expect lower numbers. You can compare the G90 MPG across all years to see if other model years are more efficient.

How it compares

The G90’s fuel economy is within the range of its competitors. The Lexus LS 500 achieves 19 MPG combined with RWD, matching the G90’s figure. The Mercedes-Benz S560 with its V8 engine also lands in the same ballpark, with an EPA-estimated 19 MPG combined. A BMW 750i xDrive drops slightly to an EPA-estimated 17 MPG combined. These differences are minor and unlikely to be a deciding factor for most buyers. The Genesis offers a significantly lower price and exceptional warranty coverage.

Tips to maximize efficiency

Use the G90’s driving modes. The “Eco” mode adjusts the throttle response and transmission mapping to prioritize fuel efficiency. It might reduce the car’s responsiveness, but it can make a difference in MPG, especially on longer trips.

Anticipate traffic flow. Smooth, consistent driving is key to maximizing fuel economy. By anticipating stops and starts, you can avoid unnecessary acceleration and braking, which consume extra fuel.

Ensure proper tire inflation. Underinflated tires increase rolling resistance, which reduces fuel economy. Check your tire pressure regularly and inflate them to the recommended pressure listed on the driver’s side doorjamb.

Minimize accessories. Using power-hungry accessories like the air conditioner and heated seats can slightly decrease fuel economy. Use them with care, especially when driving in city traffic.

Consider a lighter load. Carrying unnecessary weight in the trunk or back seat forces the engine to work harder. Remove any items that aren’t essential for your trip to improve fuel economy. The 2018 Genesis G90 is a statement of luxury and value, and you can find all Genesis fuel economy data on our site.