20 MPG combined won’t excite many, especially in 2024. However, for buyers in 2018 looking for a plush, all-wheel-drive luxury sedan with a twin-turbo V6, it’s a figure that likely resided somewhere between “acceptable” and “expected.” The Genesis G90 3.3T AWD wasn’t purchased for its hybrid-rivalling fuel efficiency, but for its luxurious comfort, smooth power delivery, and distinctive presence, all at a price that significantly undercuts the established German titans. Fuel economy, in this case, is less of a priority.

City and highway performance

The EPA estimates the 2018 Genesis G90 3.3T AWD will achieve 17 MPG in the city and 24 MPG on the highway. These numbers reflect the G90’s purpose and its powertrain. In urban environments, the G90’s weight and the demands of stop-and-go traffic result in the lower city MPG figure. The twin-turbo V6 provides ample power for effortless acceleration, but that power comes at a cost. On the open road, the G90’s efficient eight-speed automatic transmission and relaxed cruising allow it to achieve a more respectable highway MPG. The smooth power delivery of the turbocharged engine allows for consistent speed without constant throttle adjustments.

Annual fuel cost

According to the EPA, the estimated annual fuel cost for the 2018 Genesis G90 3.3T AWD is $2,900. This figure is based on driving 15,000 miles per year and using the EPA’s assumed national average fuel prices at the time of testing. Actual fuel costs will vary depending on individual driving habits, local fuel prices, and the type of blend the driver purchases. Someone who drives primarily in the city will likely see a higher annual fuel cost than someone who does mostly highway driving, and those in areas with higher fuel prices will also pay more.

Real-world expectations

While the EPA provides a standardized testing protocol, real-world fuel economy is rarely a perfect match. Drivers can expect variations based on factors such as driving style, traffic conditions, climate, and even tire pressure. Aggressive acceleration, excessive idling, and neglecting routine maintenance can all negatively impact fuel economy.

It’s not uncommon for drivers to see results that are slightly above or below the EPA estimates, but significant deviations often indicate a need to adjust driving habits or address potential mechanical issues. Reviewing the G90 MPG across all years can also give prospective owners a broader picture of what to expect.

How it compares

When considering the 2018 Genesis G90 3.3T AWD, it’s important to examine how its fuel economy stacks up against its competitors. For example, the 2018 Lexus LS 500 AWD, with its 3.5L twin-turbo V6, achieves a slightly better 18 MPG city and 27 MPG highway. The BMW 740i xDrive, featuring a 3.0L turbo inline-six, returns 20 MPG city and 29 MPG highway. The Mercedes-Benz S450 4MATIC gets 19 MPG city and 28 MPG highway. The G90’s fuel economy is less competitive, and wealthy luxury buyers chose the G90 often for value for money and a less-ubiquitous brand identity compared to the German marques.

For a deeper dive, check all Genesis fuel economy data.

Tips to maximize efficiency

Gentle acceleration and braking can significantly impact fuel consumption. Avoid sudden bursts of speed and allow the car to coast whenever possible to reduce the amount of fuel needed to maintain momentum. Smoother driving will show immediate results at the pump.

Regularly check and maintain proper tire inflation. Under-inflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Consult the sticker on the driver’s side doorjamb for the recommended tire pressure and use a reliable gauge. Check the pressure at least once a month.

Minimize idling time. Modern engines consume fuel even when stationary. If you anticipate being stopped for more than a minute or two, turn off the engine. This is especially important in city driving, where idling can account for a substantial portion of fuel consumption.

Ensure regular maintenance is performed on the vehicle. A well-maintained engine operates more efficiently. Follow the manufacturer’s recommended service schedule, including oil changes, air filter replacements, and tune-ups. Addressing minor issues promptly can prevent them from escalating into major problems that negatively impact fuel economy.

Reduce the vehicle’s weight. Excess cargo in the trunk or rear seats adds unnecessary strain on the engine, decreasing fuel efficiency. Remove any items that are not essential for daily driving, such as sports equipment or rarely used tools.