The 2017 BMW 640i Coupe gets 24 MPG combined. This number is adequate for a grand touring car, suitable for those who value style and power more than fuel efficiency, but unlikely to be a key selling point. The 640i Coupe is for drivers who want strong performance, comfortable long-distance travel, and classic BMW design.

City and highway performance

The EPA estimates the 640i Coupe at 21 MPG in the city and 30 MPG on the highway. The city MPG reflects stop-and-go traffic, where the 3.0L turbocharged inline-six engine works harder and the automatic transmission shifts more often. The highway MPG shows how relaxed the 640i is at higher speeds, where the engine runs more efficiently, and the car’s shape helps reduce fuel consumption. The eight-speed automatic transmission (S8) is important in both situations, offering smooth shifts and optimized gear ratios for both performance and efficiency. This data is consistent across all BMW fuel economy reports.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2017 BMW 640i Coupe at $2,400. This is based on driving 15,000 miles per year and using the national average fuel price at the time of calculation. Individual costs will vary based on driving habits, local fuel prices, and how much city versus highway driving you do. This $2,400 figure is a useful benchmark for budgeting and comparing the 640i’s operating expenses with other cars in its class. For a premium car with its performance, this cost is a reasonable tradeoff for many buyers considering 640I MPG across model years.

Real-world expectations

While the EPA estimates provide a baseline, real-world fuel economy often differs. Aggressive driving, frequent acceleration, and skipping maintenance can all hurt fuel efficiency. Driving smoothly, keeping tires properly inflated, and following the manufacturer’s service schedule can help you reach or even beat the EPA numbers. Owners should also know that the 640i Coupe needs premium fuel, which increases the overall cost.

How it compares

The 2017 BMW 640i is in a competitive class of luxury coupes. The Audi A7 with its supercharged 3.0L V6 gets similar numbers, around 21 MPG city and 29 MPG highway. The Mercedes-Benz E400 Coupe, with its turbocharged 3.0L V6, also has comparable numbers. The 640i is different not in fuel efficiency, but in how it drives and feels. The Porsche 911 Carrera, while faster, typically gets slightly lower numbers, around 20 MPG city and 28 MPG highway, showing its focus as a sports car. For buyers who want the best fuel economy, a hybrid or electric car is better. But for those wanting performance, luxury, and style, the 640i’s fuel use is an acceptable tradeoff.

Tips to maximize efficiency

Use Eco Pro mode when you can. This mode adjusts the engine and transmission for the best fuel efficiency, reducing throttle response and shifting to higher gears sooner. It’s a great way to improve MPG when commuting without losing too much performance.

Check your tire pressure often. Underinflated tires increase rolling resistance, which negatively impacts fuel economy. Check the tire pressure sticker on the driver’s side doorjamb and inflate the tires to the recommended level. Even a little more pressure can help.

Avoid idling. Idling burns fuel without going anywhere. If you’ll be stopped for more than a minute or two, turn off the engine. Modern engines restart quickly and efficiently, so there’s no need to leave them running.

Pay attention to how you drive. Smooth acceleration and gentle braking are important for the best fuel efficiency. Avoid aggressive driving like hard launches and quick stops, as these use much more fuel. Predicting traffic flow and keeping a steady speed can also improve MPG.

Think about using cruise control on the highway. Maintaining a constant speed reduces acceleration and deceleration, which can improve fuel efficiency. Be sure to turn off cruise control in heavy traffic or bad weather.