22 MPG combined is the number you need to understand before considering the 2015 Hyundai Genesis RWD with the 3.8L V6. It’s not a standout figure, but it’s about par for the course for a large, rear-wheel-drive luxury sedan packing a naturally aspirated six-cylinder engine. More importantly, the Genesis buyer isn’t shopping for ultimate fuel sipping. They are looking for a refined, comfortable, and stylish alternative to the established German marques, often prioritizing value and features over efficiency.

City and highway performance

The EPA estimates the 2015 Genesis 3.8 RWD manages 18 MPG in the city and 28 MPG on the highway. The city figure reflects the reality of driving around town in a car that prioritizes smooth power delivery and comfort. Stop-and-go traffic will take its toll.

The highway number, however, is more respectable. The eight-speed automatic transmission helps the Genesis settle into a relaxed cruise, allowing the engine to operate in its most efficient range. That said, the generous horsepower often entices drivers to apply more throttle, which will reduce highway numbers significantly.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2015 Hyundai Genesis RWD 3.8L V6 at exactly $2,000. 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. It also uses the EPA’s estimate for the national average fuel price. Keep in mind that your actual fuel cost will vary depending on your driving habits, the price of gasoline in your area, and the percentage of city versus highway driving you do.

Real-world expectations

While the EPA numbers provide a baseline, real-world fuel economy can vary significantly. The 2015 Genesis 3.8 RWD encourages a particular driving style. Its smooth, torquey V6 is enjoyable to drive, and its comfortable ride encourages longer journeys. Drivers who frequently accelerate quickly or cruise at higher speeds will likely see fuel economy numbers slightly below the EPA estimates. Conversely, those who are gentle on the accelerator and prioritize highway cruising may achieve numbers closer to, or even slightly above, the 28 MPG highway rating. As is always the case, driving style is a critical factor. You can see GENESIS MPG across all years on our site.

How it compares

Compared to its rivals, the 2015 Genesis 3.8 RWD is competitive. For example, the 2015 BMW 535i, with its turbocharged inline-six, achieves a slightly better EPA combined rating of 24 MPG. The slightly smaller 2015 Cadillac CTS 2.0T RWD, with its turbocharged four-cylinder, boasts a combined 25 MPG. However, stepping up to the CTS 3.6L V6 model brings the MPG down to a similar 22 MPG combined. The Mercedes-Benz E350 from the same year achieves EPA estimates in the same ballpark as the Genesis. This comparison matters because Genesis buyers are cross-shopping these established luxury brands. If fuel economy is a top priority, some of these competitors offer slightly better numbers, often at a higher initial price, but for the price, features and overall experience, the Genesis delivers solid value. You can also view all Hyundai fuel economy data for a broader picture.

Tips to maximize efficiency

Use the Genesis’ “Eco” driving mode. This mode recalibrates the throttle response and transmission shift points to prioritize fuel efficiency. While it might make the car feel slightly less responsive, it can make a noticeable difference in city driving.

Maintain your Genesis according to the manufacturer’s recommended service schedule. Regular oil changes, properly inflated tires, and a clean air filter all contribute to optimal engine performance and fuel efficiency. Don’t skip those seemingly minor service appointments, they can pay off in the long run with better gas mileage and a more reliable vehicle.

Practice smooth and consistent driving. Avoid sudden acceleration and hard braking, as these habits significantly decrease fuel economy. Anticipate traffic conditions and allow for gradual slowing down whenever possible. The Genesis is a comfortable cruiser, and smooth driving complements its overall character.

Minimize idling time. If you’re stopped for more than a minute or two, turn off the engine. Modern engines are designed to restart quickly and efficiently. Excessive idling consumes fuel without covering any distance. This is particularly important during cold starts, as idling doesn’t effectively warm up the engine.

Consider tire pressure. Check your tire pressure regularly and maintain it at the recommended levels specified in the owner’s manual or on the doorjamb sticker. Underinflated tires increase rolling resistance, which reduces fuel efficiency. A simple check with a tire pressure gauge can make a surprising difference.