The 2020 Genesis G80 RWD 3.8L’s 21 MPG combined might not seem impressive, but consider the car: a luxurious, rear-wheel-drive sedan with a naturally aspirated six-cylinder engine that focuses on smooth power delivery rather than ultimate efficiency. This isn’t a hybrid, a four-cylinder turbo, or an EV. It’s for buyers who appreciate a traditional luxury car experience, and they accept the fuel consumption that comes with it.

City and highway performance

The EPA estimates 18 MPG in the city and 26 MPG on the highway for this G80 configuration. The city figure reflects stop-and-go driving, where the 3.8L engine is less efficient, especially when moving the car’s weight. The highway number is more respectable and achievable because the eight-speed automatic transmission allows the engine to cruise at lower RPMs. Aggressive driving, even on the highway, will reduce these numbers.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2020 Genesis G80 RWD 3.8L at $2,100. This is based on driving 15,000 miles per year, with 55% in the city and 45% on the highway, using the national average fuel price at the time. Changes in gas prices impact this figure; higher fuel costs increase the annual expense, and lower prices reduce it. For those driving more or less than 15,000 miles, the annual cost will change accordingly.

Real-world expectations

The EPA provides a standardized estimate, but real-world fuel economy changes based on driving habits, road conditions, and maintenance. Achieving the EPA’s estimated 21 MPG combined requires careful driving. Expect lower numbers if you accelerate hard or drive in heavy traffic, and maybe slightly better numbers while cruising on the highway in moderate temperatures. Track your fuel consumption with the car’s trip computer to understand how your driving style affects MPG.

How it compares

The G80 competes in the mid-size luxury sedan segment. A comparable BMW 540i RWD, with its turbocharged inline-six, gets a slightly better 25 MPG combined. The Lexus ES 350, known for its reliability, manages 26 MPG combined using its naturally aspirated V6. Both outperform the G80, but with different characteristics. The BMW offers more dynamic handling, while the Lexus focuses on comfort. The G80 aims for a balance of comfort and luxury without the sporty edge of its German rivals. If fuel economy is a concern, explore all Genesis fuel economy data to compare against the G80 MPG across all years.

Tips to Maximize Efficiency

Use the G80’s drive mode selector to engage “Eco” mode, which adjusts throttle response and transmission shift points to save gas. This mode reduces acceleration response but improves MPG during everyday driving, especially in the city. Eco Mode may reduce the fun of driving the car.

Make sure your G80’s tires are properly inflated to the recommended pressure on the driver’s side doorjamb. Underinflated tires increase rolling resistance, which reduces fuel economy. Check your tire pressure regularly, especially during temperature changes.

Minimize idling. Modern engines are efficient when running, but idling consumes fuel without covering distance. If you’re stopped for more than a minute, turn off the engine to save fuel. This is relevant in urban environments with frequent stoplights.

Avoid aggressive acceleration and braking. Smooth, consistent driving is key to maximizing fuel economy. Anticipate traffic flow and maintain a steady speed whenever possible. This driving style saves fuel and reduces wear and tear on your vehicle.