20 MPG combined won’t lead to lower fuel costs, but for the 2021 BMW M850i xDrive Coupe 4.4L 8-cyl, fuel economy is secondary. This car is designed for comfortable long drives and thrilling performance, and its buyers prioritize power and presence over Prius-like efficiency. The M850i is a statement, a luxury experience, and a performance machine in a stunning coupe.

City and highway performance

The EPA estimates for the M850i xDrive Coupe are 17 MPG in the city and 25 MPG on the highway. This difference reflects the car’s character. In stop-and-go city driving, the turbocharged 4.4L V8 is constantly working to move its weight. On the open road, the engine management system and smooth-shifting 8-speed automatic transmission allow the vehicle to cruise relatively efficiently. The highway figure shows the M850i’s true purpose: covering miles in comfort and style. This car makes every drive feel special.

Annual Fuel Cost

The EPA estimates the annual fuel cost for the 2021 BMW M850i xDrive Coupe will be approximately $2,900. 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, using national average fuel prices at the time of calculation. For owners of a vehicle in this price range, the fuel cost is likely less important than the joy of driving a high-performance machine, but understanding the overall cost of ownership is still important.

Real-World Expectations

EPA estimates provide a benchmark, but real-world fuel economy can vary depending on driving habits, traffic, and terrain. Drivers who frequently use the engine’s power will likely see figures closer to the city estimate, or even lower.

However, those who accelerate smoothly and maintain consistent speeds on the highway may achieve results closer to, or even slightly above, the EPA’s 25 MPG rating. Expecting significantly better than the official estimates is probably unrealistic, given the car’s performance and weight.

How It Compares

The M850i’s fuel economy is in the middle of its competitors. The Mercedes-Benz S560 Coupe, with its powerful V8, achieves roughly the same combined MPG as the M850i. The Porsche 911 Carrera S offers a different driving experience, but boasts around 21 MPG combined. An Audi RS5 offers a slightly higher combined EPA rating, around 22 MPG, although its smaller engine means less power. The M850i buyer is focused on the complete package of performance, luxury, and styling, and considers the fuel economy a compromise for the experience the car provides. For more information on M850I MPG across all years, you can find more on our site. You can also find all Bmw fuel economy data here.

Tips to Maximize Efficiency

Use the BMW’s driving modes. The “Eco Pro” mode optimizes engine and transmission settings for maximum fuel efficiency. It will reduce performance, but it’s effective for commutes or highway driving when power isn’t needed.

Accelerate and brake smoothly. Abrupt acceleration and hard braking waste fuel. Anticipate traffic flow and maintain a steady pace to minimize fuel consumption.

Make sure your tires are properly inflated. Underinflated tires increase rolling resistance, which reduces fuel efficiency. Check your tire pressure regularly and maintain the levels specified in the owner’s manual.

Avoid idling. If you’ll be stopped for more than a minute, turn off the engine. Modern engines restart quickly, and idling wastes more fuel.

Reduce aerodynamic drag. Remove any unnecessary items from the roof or trunk that increase drag. Even small changes can affect fuel consumption, especially at highway speeds.