17 MPG combined isn’t going to win any fuel economy awards, but for the 2021 BMW M5, with its powerful 4.4L twin-turbo V8 and track-honed chassis, that number is almost beside the point. This isn’t a car bought by those highly focused on minimizing their carbon footprint. The M5 is for the driver who demands uncompromised performance, a visceral connection to the road, and the ability to unleash supercar-rivaling acceleration instantly. Practicality takes a distant second place to sheer driving exhilaration.

City and highway performance

The official EPA ratings break down to 15 MPG in the city and 21 MPG on the highway. The city figure reflects stop-and-go traffic, the constant temptation to accelerate, and the M5’s substantial curb weight. The highway number is easier to accept, but even on long journeys, the M5’s strong power output and relatively short gearing will keep the engine turning over at a fairly high RPM, reducing overall efficiency. These numbers are tested in controlled conditions, but the aggressiveness of the M5 is rarely held back in everyday driving.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2021 BMW M5 at $3,400. This calculation is based on driving 15,000 miles per year, with 45% of those miles driven in the city and 55% on the highway. It also assumes the use of the current national average fuel price, which fluctuates throughout the year. If you drive more aggressively, live in an area with higher fuel costs, or drive more than 15,000 miles annually, expect to exceed this figure significantly. It’s a cost of entry for enjoying the M5’s unparalleled performance.

Real-world expectations

While the EPA ratings offer a baseline, real-world fuel economy will vary considerably depending on driving style and conditions. M5 owners aren’t known for their restraint, and the intoxicating sound and ferocious acceleration of the V8 can encourage a heavier right foot. Expect to see numbers closer to the city rating in mixed driving if you frequently exploit the car’s performance potential. However, on long highway trips, driven conservatively, achieving the EPA’s 21 MPG highway rating is certainly possible. For more data, check the M5 MPG across all years.

How it compares

The M5 exists in a small segment of high-performance sedans, and its fuel economy reflects that. The Mercedes-AMG E63 S, a direct competitor, achieves around 16 MPG combined. The Audi RS 7, with its own twin-turbo V8, fares similarly, hovering around 18 MPG combined. Even the Porsche Panamera Turbo, while offering a plug-in hybrid variant for improved efficiency, sees figures around 19 MPG combined in its non-hybrid V8 form. These figures show that performance comes at a price, and fuel economy is rarely the main concern for buyers in this category. For a better view of all BMW vehicles, browse all Bmw fuel economy data.

Tips to maximize efficiency

While the M5 is far from a fuel-sipping commuter, there are ways to mitigate its thirst for premium gasoline. Gently accelerate from a stop and avoid abrupt throttle inputs. The twin-turbo V8 is incredibly responsive, but using its full potential every chance you get will hurt your fuel economy.

Use the M5’s adaptive driving modes. Selecting “Comfort” or “Eco Pro” will reduce throttle response, encourage earlier upshifts, and reduce overall engine output, which will improve fuel efficiency. These modes make the most of the automatic (S8) transmission programming.

Anticipate traffic flow and maintain a consistent speed whenever possible. Frequent braking and acceleration cycles waste fuel. Leaving a safe following distance allows you to better anticipate slowdowns and avoid unnecessary braking, improving efficiency.

Ensure your tires are properly inflated. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Check your tire pressures regularly to optimize efficiency and handling.

Consider minimizing aerodynamic drag. While this isn’t a primary concern for most M5 owners, removing roof racks or cargo carriers when not in use can slightly improve fuel economy, especially at higher speeds on the highway.