The 2021 BMW M440i Convertible’s 26 MPG combined fuel economy won’t impress those seeking maximum efficiency, but it’s likely acceptable for buyers who value open-air driving and strong performance more than saving money at the pump. This car isn’t designed for hypermiling. It’s a statement, a reward, and an invitation to weekend getaways, all wrapped in attractive styling. Therefore, its efficiency should be considered within the context of its capabilities and intended purpose.

City and highway performance

Official EPA estimates for the M440i Convertible are 23 MPG in the city and 31 MPG on the highway. The lower city MPG reflects stop-and-go conditions and the temptation to push the responsive engine. The 31 MPG highway rating demonstrates the B58 engine’s efficiency while cruising at steady speeds. The M440i Convertible excels on long weekend trips with the top down, effortlessly covering miles while using a reasonable amount of fuel.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2021 BMW M440i Convertible at $2,250. This assumes 15,000 miles of driving per year and calculations based on national average fuel prices. Fuel costs will vary depending on driving habits and local fuel prices, and this car requires premium fuel. Consider the $2,250 a benchmark; many M440i Convertible buyers accept this cost as part of owning a vehicle that blends performance and luxury.

Real-world expectations

While the EPA provides standardized fuel economy testing, actual MPG may differ. Aggressive driving, frequent short trips, and extended idling can reduce fuel economy. However, a driver who anticipates traffic, uses cruise control, and maintains proper tire inflation might see numbers closer to or even better than the EPA estimates. The M440i’s automatic transmission shifts efficiently, but using the engine’s power will lower MPG figures.

How it compares

The M440i Convertible competes in a segment where fuel economy can influence buying decisions. The Audi S5 Cabriolet achieves an EPA-rated 20 MPG city and 28 MPG highway, making the M440i a slightly more efficient choice on paper. The Porsche 718 Boxster S, while offering a different driving experience, gets around 21 MPG city and 27 MPG highway. Other BMW models are relevant too. You can see all Bmw fuel economy data on this site. The less powerful BMW 430i Convertible achieves better fuel economy, with an EPA-rated 25 MPG city and 34 MPG highway, a difference that might appeal to efficiency-minded buyers. If cross-shopping, be sure to consider M440I MPG across all years to see how this model compares to previous versions.

Tips to maximize efficiency

The M440i’s inline-six engine is responsive, encouraging drivers to accelerate quickly, but resisting this urge is crucial for better fuel economy. Gradual acceleration and anticipating traffic can significantly reduce fuel consumption. Avoid quick starts and unnecessary bursts of speed to save fuel.

Proper tire inflation is always important, especially on a performance car like the M440i. Underinflated tires increase rolling resistance, forcing the engine to work harder. Check tire pressures regularly and inflate them to the recommended levels to improve MPG.

The M440i’s automatic transmission offers different driving modes that affect fuel consumption. Selecting “Eco Pro” mode changes throttle response and shift points to prioritize efficiency over performance. While not ideal for spirited driving, it can noticeably improve MPG on commutes or long highway drives.

Reduce unnecessary weight in the vehicle. Extra cargo increases the car’s overall mass, requiring more energy to accelerate. Removing unnecessary items from the trunk and rear seats can improve fuel efficiency.

Regular maintenance is important for optimal fuel economy. A well-maintained engine runs more efficiently. Following the recommended maintenance schedule, including oil changes, air filter replacements, and spark plug inspections, ensures that the M440i operates at its best and uses less gas.