16 MPG combined is what you get with the 2017 BMW M6 Convertible. No one buys a twin-turbo V8 convertible expecting Prius-like economy. This car is about a visceral experience, raw power, luxurious appointments and top-down thrills. Buyers accept the fuel consumption because they are prioritizing performance and prestige. They want the sound, the fury and the badge. Economy is a distant consideration.

City and highway performance

The M6 Convertible’s EPA estimates confirm its thirst: 14 MPG in the city and 20 MPG on the highway. The city figure reflects stop-and-go driving, which constantly calls upon the powerful engine to overcome the car’s weight. The highway number is only marginally better because even at cruising speeds, the 4.4L V8 is always ready to unleash its considerable horsepower, and the automatic AM-S7 transmission offers quick and precise shifts, but doesn’t prioritize saving fuel. It’s programmed for performance above all else. This car encourages aggressive driving, and the figures reflect that.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2017 BMW M6 Convertible at $3,600. This figure is based on driving 15,000 miles per year, with 45% of those miles driven in the city and 55% on the highway, using national average fuel prices. This is significantly higher than the average vehicle, highlighting the financial commitment required to own and operate this high-performance machine. Potential buyers should factor this cost into their ownership budget alongside insurance, maintenance and other expenses. If $3,600 per year for fuel gives you pause, this probably isn’t your car.

Real-world expectations

While the EPA provides a standardized estimate, real-world fuel economy for the M6 Convertible can vary depending on driving style and conditions. Drivers with a heavy foot can easily see their MPG dip below the EPA estimates. Conversely, those who adopt a more conservative approach, anticipating traffic and minimizing aggressive acceleration, might achieve figures closer to, or even slightly above, the official numbers. However, most people buying an M6 aren’t doing so to drive conservatively. The temptation to exploit the car’s performance potential will almost always win out, resulting in fuel consumption closer to the lower end of the spectrum. See M6 MPG across all years and you will find that fuel economy is never a strong point of this model.

How it compares

The M6 Convertible occupies a unique niche, but comparing it to alternatives helps put its fuel economy into perspective. The Mercedes-AMG SL63, another high-performance convertible, achieves around 16 MPG combined with its V8. The Porsche 911 Turbo S Cabriolet offers slightly better figures, around 19 MPG combined, thanks to its more advanced engine technology, but it’s still far from economical. Even sedans like the BMW M5, which shares a similar powertrain, often achieve marginally better fuel economy (around 17 MPG combined) due to their more aerodynamic shape and lower weight. These comparisons reinforce that the M6 Convertible’s fuel consumption is expected give its exceptional performance and open-top driving experience. Compare all BMW fuel economy data and you will find that the M6 sits at the bottom of the list with other high-performance BMWs.

Tips to maximize efficiency

While the M6 Convertible isn’t designed for fuel efficiency, there are steps you can take to reduce gas consumption. Avoid aggressive acceleration and hard braking, as these actions rapidly consume fuel. Instead, strive for smooth, gradual inputs and maintain a steady speed whenever possible.

Use the car’s driving modes. The “Efficient” mode changes the throttle response and shift patterns to prioritize fuel economy. While it won’t transform the M6 into a hybrid, it can make a noticeable difference in stop-and-go traffic.

Ensure your tires are properly inflated. Under-inflated tires increase rolling resistance, forcing the engine to work harder and reducing fuel economy. Check your tire pressure regularly and inflate them to the recommended specification.

Reduce unnecessary weight. Carrying excessive cargo in the trunk or on the back seats increases the car’s overall weight, impacting fuel consumption. Remove any unnecessary items to lighten the load.