17 MPG combined. Let’s be frank: that number won’t be plastered across any BMW marketing materials for the 2025 M8 Competition Gran Coupe. This isn’t a car for penny-pinchers or hypermilers. The M8 Competition Gran Coupe is for those who prioritize breathtaking acceleration, impeccable handling, and a commanding presence over saving fuel. Its drivers accept the penalty at the pump as a necessary cost to enter the exclusive club of high-performance luxury.

City and highway performance

The M8 Competition Gran Coupe’s split of 15 MPG in the city and 22 MPG on the highway reflects its dual nature. In urban environments, the stop-and-go traffic and frequent bursts of acceleration take their toll. The 4.4-liter twin-turbo V8 is always eager to unleash its power, even with a gentle tap of the accelerator. Out on the open road, the M8 fares better, although exploiting its vast performance reserves will rapidly diminish any fuel-saving efforts. The automatic S8 transmission, while incredibly responsive, doesn’t prioritize maximizing efficiency in its sportier modes.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2025 BMW M8 Competition Gran Coupe at $3,400. 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 the national average fuel prices. This is an average, and it’s one that many M8 owners could well exceed given the temptation to explore the car’s performance capabilities.

Real-world expectations

Enthusiast publications and early owner reports suggest that achieving the EPA’s combined rating in the real world requires a disciplined approach to driving. Owners who regularly engage the car’s M modes, exploit its launch control, or frequently drive in congested conditions are likely to see significantly lower numbers. If you’re considering an M8 Competition Gran Coupe, factor in the probability of exceeding that $3,400 annual fuel cost. Explore all Bmw fuel economy data before making any final decisions.

How it compares

The M8 Competition Gran Coupe exists in a rarefied segment where fuel economy is less important than performance and prestige, but it’s still useful to draw comparisons. The Porsche Panamera Turbo S E-Hybrid, despite its hybrid powertrain, achieves only 19 MPG combined, a marginal improvement that comes with a considerably higher price tag. An Audi RS7 averages around 18 MPG, close to the M8, while the Mercedes-AMG GT 63 S 4-Door Coupe lands around 16 MPG. Buyers in this segment usually cross shop all of these models. Looking at M8 MPG across all years can offer some perspective, but newer models will always be more relevant.

Tips to maximize efficiency

Resist the urge to constantly explore the upper reaches of the tachometer. The M8’s twin-turbo V8 delivers immense torque across a wide range of RPMs. Short-shifting and using that torque can significantly improve fuel consumption in everyday driving.

Use the car’s various driving modes. Comfort mode softens the throttle response, reduces the aggression of the transmission, and relaxes the suspension, all contributing to a more fuel-efficient driving experience when outright performance isn’t necessary.

Pay attention to tire pressures. Properly inflated tires reduce rolling resistance, improving fuel economy and extending tire life. Consult the sticker on the driver’s side door jamb for the recommended tire pressures for your M8 Competition Gran Coupe and check them regularly.

Avoid excessive idling. Modern engines consume fuel even when stationary. If you’re stopped for more than a minute, it’s generally more efficient to turn off the engine. The M8’s start/stop system can assist with this in certain situations.