20 MPG combined is what you get with the 2020 BMW M850i xDrive Coupe. It’s a figure practical M car shoppers might justify, especially when weighed against the car’s performance and style. Fuel economy is unlikely to be a main concern for those drawn to a twin-turbo V8 coupe like this. The M850i shopper prioritizes power, a luxurious interior, and a distinctive presence; the compromise on efficiency is simply the cost.

City and highway performance

The EPA estimates the M850i xDrive Coupe achieves 18 MPG in the city and 25 MPG on the highway. The city figure reflects stop-and-go traffic, where the 4.4-liter twin-turbo V8 is constantly working because of the car’s weight. The highway number reflects the engine’s thirst. At higher speeds, even with the efficient automatic transmission in its top gear, the V8 is generating power to maintain momentum, requiring fuel. The M850i is fun to drive; a gentle approach feels wrong in a car like this.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2020 BMW M850i xDrive Coupe at $2,900. This is based on driving 15,000 miles per year, using the EPA’s combined MPG rating, and assuming national average fuel prices. It’s a useful benchmark, though expenses will vary depending on driving habits and local fuel costs. Drivers who accelerate often or spend more time in congested city environments can expect to exceed this annual cost, while those who primarily cruise on the highway could see lower numbers.

Real-world expectations

While the EPA provides a benchmark, real-world fuel economy often changes. The M850i’s twin-turbo V8 is sensitive to driving style. Frequent bursts of acceleration, aggressive cornering, and extended periods in Sport mode will all contribute to lower MPG. Consistent gentle driving on the highway might yield slightly better-than-EPA results. Expect to see numbers close to the EPA estimates, but don’t be surprised if they change depending on your driving habits and environment. Owners who track their fuel economy might try to squeeze every last mile out of each gallon, but a driver leasing the car for image purposes probably won’t bother.

How it compares

The 20 MPG combined rating of the M850i places it with other high-performance grand tourers. A Mercedes-AMG S63 Coupe, producing similar power, achieves a comparable 19 MPG combined. The Porsche 911 Carrera S, while lighter and more efficient, still only manages around 21 MPG combined. Even all Bmw fuel economy data reveals few models in the same performance bracket that offer significantly better economy. The M850I MPG across all years shows similar results. Its value isn’t economical, but competitive within its class of luxury coupes.

Tips to maximize efficiency

While the M850i isn’t designed for hypermiling, there are strategies to improve fuel economy without sacrificing driving enjoyment. Avoid aggressive acceleration and braking, allowing the car to coast naturally whenever possible. The instantaneous fuel economy meter in the instrument cluster can be a guide to understand how your driving habits impact fuel consumption.

Use the car’s driving modes intelligently. Comfort mode provides a softer throttle response and earlier upshifts, optimizing fuel efficiency for everyday driving. Switch to Sport or Sport+ mode only when you want to unleash the car’s full potential.

Ensure that your tires are properly inflated. Underinflated tires increase rolling resistance, leading to decreased fuel economy. Check your tire pressures regularly and maintain them at the recommended levels.

Minimize unnecessary weight in the car. Extra cargo adds to the car’s mass, requiring more energy to accelerate and maintain speed. Remove any items you don’t need to lighten the load.

Consider using the auto start-stop function. It may save a small amount of fuel in stop-and-go traffic, some drivers find it intrusive. Deactivate it if it detracts from your driving experience, but remember activating the function and being patient may help improve fuel economy.