25 MPG combined is a justifiable number for the 2023 BMW M440i xDrive Convertible. It’s not going to win any hypermiling contests, but it’s not designed to. This car is about exhilarating performance with the top down, and fuel economy is a secondary consideration for its target buyer: affluent individuals and couples who prioritize driving pleasure, exclusivity, and open-air thrills. They want a car that looks good parked outside a trendy restaurant and provides effortless power when cruising down a coastal highway. Saving a few dollars at the pump is likely far down the list of priorities.

City and highway performance

The EPA estimates the M440i xDrive Convertible at 22 MPG in the city and 31 MPG on the highway. The city number reflects the stop-and-go nature of urban driving, where frequent acceleration and braking cycles work against optimal fuel efficiency. The highway figure, achieved during steady-state cruising, demonstrates the efficiency potential of the 3.0-liter inline-six engine when it’s not constantly being asked to unleash its 382 horsepower and 369 lb-ft of torque. This difference underscores that driving style plays a significant role in the real-world MPG you’ll achieve.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2023 BMW M440i xDrive Convertible at $2,300. This figure is based on driving 15,000 miles per year and using national average fuel prices. Of course, actual fuel costs will vary depending on individual driving habits, local fuel prices, and the type of fuel used. While the M440i doesn’t require premium fuel, it’s highly recommended to unlock its full performance potential, which can also impact fuel expenses. This estimate represents the ongoing ownership expenses owners need to consider, and should be weighed against all Bmw fuel economy data to see the bigger picture.

Real-world expectations

While the EPA estimates provide a useful baseline, real-world fuel economy will vary. Aggressive driving, frequent short trips, and prolonged idling can all negatively impact MPG. Owners who prioritize performance and frequently use the M440i’s Sport mode will likely see numbers closer to the city estimate, or even lower. Conversely, those who primarily use the car for longer highway journeys and adopt a more relaxed driving style may exceed the EPA’s highway rating. Factors such as tire pressure, vehicle maintenance, and the use of accessories like air conditioning can also influence fuel consumption. Remember to consult with the M440I MPG across all years, to understand what owners achieve in the real world.

How it compares

In the realm of luxury performance convertibles, the M440i’s fuel economy is relatively competitive. The Porsche 718 Boxster, while offering a different driving experience, achieves around 24 MPG combined with its base engine. The Mercedes-AMG C43 Cabriolet delivers about 22 MPG combined, making it a thirstier choice. The Audi S5 Cabriolet, another direct competitor, mirrors the M440i’s 25 MPG combined. For buyers cross-shopping these models, the M440i offers a blend of performance and relative efficiency. These numbers are important to those seeking the thrill of a sports convertible, but wish to avoid the worst MPG numbers in the class.

Tips to maximize efficiency

Use the M440i’s Eco Pro mode when possible. This mode adjusts engine mapping, throttle response, and transmission behavior to prioritize fuel efficiency. It’s ideal for commuting or cruising on the highway where maximum performance isn’t required.

Maintain a smooth and consistent driving style. Avoid hard acceleration and sudden braking. Anticipate traffic flow and maintain a safe following distance to minimize the need for frequent stops and starts. The M440i’s instant torque can be addictive, but resist the urge to constantly exploit it.

Ensure your tires are properly inflated. Underinflated tires increase rolling resistance, which reduces fuel economy. Check your tire pressure regularly and inflate to the recommended levels, which can be found on a sticker inside the driver’s side doorjamb.

Minimize aerodynamic drag. Remove any unnecessary items from the car’s interior and exterior that could increase wind resistance. A roof rack or poorly fitted aftermarket accessories can significantly reduce fuel economy, but as a convertible this is less of a concern day to day.

Keep up with scheduled maintenance. A well-maintained engine runs more efficiently. Follow the manufacturer’s recommended maintenance schedule for oil changes, air filter replacements, and spark plug replacements.