23 MPG combined is acceptable for the 2018 BMW 640i Gran Coupe. Its focus is on attractive styling and easy highway driving more than high fuel efficiency. Buyers of the 640i’s sleek look and luxury features likely care more about its distinctive design, powerful inline-six engine, and the status of owning a BMW Gran Coupe, rather than saving money on gas.

City and highway performance

EPA estimates are 20 MPG in the city and 29 MPG on the highway, reflecting the 640i’s mixed performance profile. In cities, the car’s weight and frequent stops affect fuel use. But on the highway, the smooth eight-speed automatic transmission and the engine’s strong torque allow relaxed cruising. You’ll see improved gas mileage, and the 29 MPG highway number is good for a car of this size and ability, making it suitable for long trips.

Annual fuel cost

The EPA estimates the 2018 BMW 640i Gran Coupe will cost $2,500 in fuel each year. This is based on driving 15,000 miles and average national gas prices during the calculation. Your costs will change based on driving habits, local prices, and fuel grade. $2,500 is a large expense, but it’s what you can expect for a luxury performance car. Buyers in this market usually expect higher operating costs for the 640i’s driving experience and prestige.

Real-world expectations

EPA estimates are a starting point, but real-world gas mileage varies. If you accelerate quickly or often drive in city traffic, expect lower numbers than the official estimates. If you mostly drive on the highway and drive efficiently, you might get better mileage. Tire pressure, maintenance, and weather can also change fuel use. Consider the EPA estimates as a guide, and adjust them based on your driving.

How it compares

The 2018 BMW 640i Gran Coupe’s fuel economy is comparable to others in its class. The Audi A7, with its 2.0-liter turbocharged four-cylinder, gets better mileage in the city but similar highway MPG numbers to the 640i. The Mercedes-Benz CLS450, which also has an inline-six engine, has similar fuel economy. For comparison, check all Bmw fuel economy data. The Porsche Panamera, known for performance, offers similar economy in base models, but higher-performance versions use more gas and 640I MPG varies across all years. Deciding which car to buy often depends on what you like in styling, driving, and brand. Fuel economy is a secondary concern.

Tips to maximize efficiency

The 640i Gran Coupe has driving modes, including Eco Pro, which optimizes fuel use. This mode adjusts the engine, transmission, and climate control to save gas. It can reduce throttle response, but it can noticeably improve fuel consumption, particularly in cities.

Properly inflated tires reduce rolling resistance, which improves fuel economy. Check tire pressure often and inflate tires to the recommended levels on the doorjamb sticker or in the owner’s manual. Under-inflated tires decrease fuel efficiency and affect handling and tire wear.

Idling wastes fuel. If you’ll be stopped for more than a minute, turn off the engine. Modern engines restart quickly, and the fuel saved by avoiding idling adds up. This habit can improve your overall fuel economy.

Rapid acceleration and hard braking use more fuel. Drive smoothly, anticipating traffic, and avoid sudden speed changes. The 640i’s strong engine delivers good power even with moderate throttle, so you don’t need to push it hard.