The 2023 BMW M550i xDrive sedan, with its 4.4L 8-cyl engine, gets an official EPA-estimated 20 MPG combined. This number might seem surprising for a vehicle that’s close to M5 performance levels but disguised as a subtle, executive sedan. Owners likely prioritize effortless power, refined handling, and the BMW prestige over ultimate fuel efficiency. For them, 20 MPG is what it costs to experience exhilarating performance and autobahn-bred composure.

City and highway performance

The EPA estimates the M550i xDrive at 17 MPG in the city and 25 MPG on the highway. The city figure reflects the fuel-intensive nature of stop-and-go driving, where the 4.4-liter V8 is constantly working to overcome inertia. The highway figure shows the engine’s ability to cruise relatively efficiently once up to speed. This is aided by the smooth-shifting eight-speed automatic transmission. While 25 MPG might seem respectable, resisting the urge to exploit the engine’s power requires considerable willpower.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2023 BMW M550i xDrive is $2,900. This is based on driving 15,000 miles per year and using national average fuel prices for premium gasoline, which is required for optimal performance. This is an estimate, and individual driving habits, local fuel costs, and the frequency of “spirited” driving will all affect how much you spend on gas. Aggressive acceleration and frequent gear changes will increase that number significantly.

Real-world expectations

While the EPA figures provide a baseline, real-world fuel economy for the M550i xDrive often falls slightly below those numbers, particularly in mixed driving conditions. Drivers who frequently use the car’s Sport or Sport+ modes, or who live in areas with heavy traffic congestion, should expect to average closer to 18 MPG overall. However, those who primarily drive on open highways and maintain consistent speeds may see numbers closer to the EPA’s 25 MPG highway estimate. Ultimately, your mileage will vary, but knowing the M550I MPG across all years helps contextualize the 2023 model’s efficiency.

How it compares

Compared to its rivals, the M550i xDrive’s fuel economy is in a predictable range. The Mercedes-AMG E53 sedan, with its turbocharged inline-6 engine, achieves an EPA-estimated 21 MPG combined. The Audi S6, powered by a turbocharged V6, also gets 21 MPG combined. The Cadillac CT5-V, with its supercharged V8, falls lower at around 18 MPG combined. These differences might seem minor, but they can add up over years of ownership.

For the M550i buyer, these variances are less critical than horsepower, handling, and the intangible allure of the BMW brand. Those seeking better efficiency might consider the BMW 530e plug-in hybrid, although it trades some performance for better fuel economy.

Tips to maximize efficiency

Resist the urge to constantly exploit the M550i’s power. The V8 is intoxicating, but gentle acceleration and anticipating traffic flow can significantly conserve fuel. The car’s driving modes also play a role. Select “Comfort” or “Eco Pro” for everyday commuting to optimize fuel efficiency by altering throttle response and shift patterns.

Ensure your tires are properly inflated. Underinflated tires increase rolling resistance, forcing the engine to work harder and burn more fuel. Check your tire pressures regularly and maintain them at the recommended levels listed on the driver’s side doorjamb.

Avoid unnecessary idling. If you anticipate stopping for more than a minute, turn off the engine. Modern vehicles, including the M550i, are designed to restart quickly and efficiently, and prolonged idling wastes fuel and increases emissions.

Reduce weight in the vehicle. Unnecessary cargo adds extra weight, which impacts fuel economy. Remove any items from the trunk or backseat that aren’t essential for your daily travels. See all Bmw fuel economy data for other models that may suit your needs.