18 MPG combined. If you’re considering the 2025 BMW M4 Competition M xDrive Convertible, fuel economy is probably not your top concern. This isn’t a Prius or a Bolt. It’s a high-performance, open-air driving machine designed to thrill, and the thirst for premium fuel is a price accepted, and maybe even expected, by its buyers. They prioritize fast acceleration, sharp handling, and the thrilling sound of a twin-turbocharged inline-six, amplified by the wind in their hair.

City and highway performance

The EPA estimates 16 MPG in city driving and 22 MPG on the highway. The city figure reflects stop-and-go traffic, where the M4’s powerful engine is constantly surging and braking. The highway estimate, while slightly better, still shows the M4’s performance-oriented nature; even at cruising speeds, the engine isn’t stressed, and any enthusiastic use of the accelerator will quickly decrease fuel efficiency. Consider these numbers more as a baseline than a promise.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2025 BMW M4 Competition M xDrive Convertible at $3,200. This is based on driving 15,000 miles per year, with a mix of city and highway driving, and using the national average fuel price for premium gasoline. Remember that this is an average; your actual fuel costs may vary depending on your driving habits, location, and the price of high-octane fuel. Expect a lower annual cost if you only drive the M4 on weekends; prepare for a higher one if you drive it hard.

Real-world expectations

The EPA provides a standard benchmark, but real-world fuel economy will vary based on driving style and conditions. Frequent use of the M4’s power, which is tempting, will lead to lower MPG figures. Aggressive acceleration, hard braking, and extended periods in Sport or Sport+ driving modes will all decrease fuel efficiency.

However, a more relaxed driving style, good throttle control and strategic use of cruise control, might allow drivers to approach the EPA estimates. But owning an M4 Convertible isn’t really about that. Check out M4 MPG across all years for more information.

How it compares

The M4 Convertible’s fuel economy is similar to its rivals. The Mercedes-AMG C63 S Convertible, with its handcrafted V8, gets a slightly lower 17 MPG combined. The Audi RS5 Cabriolet, with its turbocharged V6, gets a comparable 18 MPG. The Porsche 911 Carrera Cabriolet, a benchmark vehicle, can achieve around 20 MPG depending on the configuration.

These MPG differences are small and probably won’t sway most buyers. People who want better efficiency within the Bmw range can view all Bmw fuel economy data.

Tips to maximize efficiency

The M4 Convertible isn’t designed for hypermiling, but you can reduce fuel consumption. Gentle acceleration and avoiding hard braking can improve fuel efficiency. Watch traffic flow and maintain a steady speed.

Choose the “efficient” driving mode when you can. The M4’s drive modes let you customize the car’s responsiveness. More relaxed settings can reduce the engine’s eagerness and reduce fuel consumption during everyday driving.

Keep your tires properly inflated. Underinflated tires increase rolling resistance, which then reduces fuel efficiency. Regularly check your tire pressure and keep it at the recommended levels to get better gas mileage.

Don’t idle the engine. Letting the engine idle for a long time consumes fuel without going anywhere. If you’ll be stopped for more than a minute or two, switch off the engine.

Service your car regularly. A well-maintained engine operates more efficiently. Follow the manufacturer’s maintenance schedule, including oil changes, air filter replacements, and spark plug inspections, to ensure good performance and fuel economy.