20 MPG combined probably isn’t the main reason someone buys a 2021 BMW M550i xDrive. People buy this car because they value effortless power, all-weather confidence, and an understated aggression that only a twin-turbo V8 can provide. Fuel economy matters, but it’s secondary to the thrill of 523 horsepower and the car’s ability to devour highway miles with unmatched composure.

City and highway performance

The EPA estimates for the M550i xDrive are 17 MPG in the city and 25 MPG on the highway. The city figure reflects stop-and-go traffic and the temptation to exploit the engine’s responsiveness. The V8’s instant torque encourages brief bursts of acceleration, which impacts fuel consumption in urban environments. The 25 MPG highway figure is more realistic, especially on longer trips where the car settles into a comfortable, fuel-efficient cruise. Achieving these highway numbers requires restraint; pushing the M550i towards triple-digit speeds will reduce fuel economy quickly.

Annual fuel cost

Based on the EPA’s estimates of 15,000 miles per year and national fuel price averages, the 2021 BMW M550i xDrive will likely cost $2,900 per year in fuel. This provides a baseline for comparison against other vehicles. Individual fuel costs will vary based on driving habits, local fuel prices, and the type of fuel used. The M550i requires premium fuel, adding to the expense.

Real-world expectations

While the EPA estimates provide a benchmark, the M550i xDrive’s real-world MPG can change a lot. Drivers who often drive aggressively with hard acceleration and braking will likely see lower fuel economy than the EPA estimates. However, drivers who prioritize fuel efficiency can potentially match or slightly exceed the EPA’s numbers, especially on the highway. Factors like tire pressure, ambient temperature, and cargo weight can also influence fuel consumption.

How it compares

The M550i xDrive’s fuel economy is predictably average compared to its competitors. The Mercedes-AMG E53 sedan, which uses a hybrid-assisted inline-six engine, gets a slightly better 23 MPG combined. The Audi S6, powered by a similar twin-turbo V6, gets 21 MPG combined. The higher-performance M5 offers even worse fuel economy. This comparison shows the trade-off when buying a high-performance sedan. Buyers in this segment often sacrifice some fuel efficiency for enhanced performance and driving dynamics. You can review all Bmw fuel economy data right here.

Tips to maximize efficiency

A critical step to improving fuel economy in the M550i xDrive is to maintain consistent tire pressure. Check your tires regularly and inflate them to the recommended pressure on the doorjamb sticker. Properly inflated tires reduce rolling resistance, minimizing the engine’s work.

Use the M550i’s driving mode selector to your advantage. “Eco Pro” mode will remap the throttle response and optimize shift patterns, and it may reduce the power used by accessories like the air conditioning. Eco Pro won’t turn the M550i into a Prius, but it can improve fuel efficiency if used consistently, and it provides a way to review M550I MPG across all years.

Avoid aggressive acceleration and hard braking. Smooth, gradual acceleration and anticipating when you need to brake conserve fuel and reduce wear on your brakes. The M550i’s powerful brakes encourage late braking, but resisting that urge will result in better MPG and safer driving.

Minimize idling time. If you expect to be stationary for more than a minute, turn off the engine. Modern engines are designed to restart quickly and efficiently, and avoiding prolonged idling can reduce fuel consumption, particularly in city driving. This is especially true in the M550i with its large V8.