18 MPG combined isn’t going to win any awards for lower fuel costs, but the 2024 BMW M4 Competition M xDrive Convertible isn’t trying to. This is a high-performance, open-top machine designed for thrills, not hypermiling. The fuel economy is the price of admission to blistering acceleration and razor-sharp handling. The typical buyer understands this tradeoff and prioritizes the experience far above the cost at the pump.

City and highway performance

The EPA estimates the M4 Competition Convertible at 16 MPG in the city and 23 MPG on the highway. The lower city figure reflects stop-and-go driving conditions that constantly demand bursts of power from the twin-turbocharged 3.0-liter inline-six. The highway number is more respectable, but the M4’s thrust makes maintaining a steady, fuel-efficient cruise challenging. The temptation to unleash all 503 horsepower is ever-present. Even with the slick-shifting 8-speed automatic transmission, aggressive driving will quickly deplete the fuel tank.

Annual fuel cost

According to the EPA, the annual fuel cost for the 2024 BMW M4 Competition M xDrive Convertible is $3,200. This figure is based on driving 15,000 miles per year and using national average fuel prices. This makes the M4 one of the more expensive vehicles to fuel among its competitive set. Drivers who frequently indulge in the M4’s performance potential, or who rack up more annual miles, can expect to spend significantly more.

Real-world expectations

Real-world fuel economy for the M4 Competition Convertible is likely to vary based on driving style. Those who primarily drive in urban environments with heavy traffic and enjoy frequent spirited acceleration can expect to see numbers closer to the EPA’s city estimate, or even slightly lower. Conversely, drivers who spend more time on the highway and adopt a more relaxed driving style might achieve fuel economy closer to, or even slightly exceeding, the EPA’s highway estimate. However, it is unrealistic to expect Prius-like efficiency from a car engineered for high performance. The M4 rewards aggressive driving, and owners will often happily pay the price. You can view M4 MPG across all years to see a broader trend.

How it compares

The M4’s fuel economy is predictably lower than many of its competitors. The Porsche 911 Carrera S, for instance, is rated at 20 MPG combined (18 city/25 highway), offering a slightly less punishing experience at the pump, but is in the same realm as the M4. The Mercedes-AMG C63 S Coupe, with its beastly V8, comes in at similar 18 MPG combined (16 city/24 highway). The Audi RS5 Coupe achieves a slightly better 21 MPG combined (18 city/28 highway). While these differences might seem significant on paper, they are unlikely to sway the M4 buyer. This person is focused on the unique driving experience and will accept the corresponding fuel costs. This buyer could also look at all Bmw fuel economy data to comparison shop across the brand.

Tips to maximize efficiency

While the M4 isn’t designed for maximum fuel economy, there are still things you can do to improve your MPG without sacrificing all the fun. Avoid aggressive acceleration and braking. The M4’s potent engine and responsive brakes can bleed fuel quickly when used aggressively. Smooth, steady throttle inputs and gentle braking will reduce fuel consumption without detracting too much from the driving experience.

Use the M4’s driving modes. The car offers various driving modes, including an “Efficiency” or “Eco” mode. Select these modes when possible to optimize the engine and transmission settings for fuel economy. These modes typically reduce throttle response and shift earlier, resulting in lower fuel consumption.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, which can significantly reduce fuel economy. Check your tire pressure regularly and inflate them to the recommended levels specified in the owner’s manual. This simple step can improve fuel economy and extend tire life.

Reduce unnecessary weight. Carrying extra weight in your vehicle requires the engine to work harder, reducing fuel economy. Remove any unnecessary items from the trunk and passenger compartment to lighten the load. This can make a noticeable difference, especially in city driving.