24 MPG combined doesn’t immediately scream “fuel sipper,” but for the 2021 BMW M240i Convertible with its 3.0L inline-six, it’s a compromise most owners accept. This isn’t a vehicle designed for hypermiling; it’s built for thrills, which requires a potent engine. The M240i Convertible appeals to someone prioritizing open-air motoring, responsive handling, and the unmistakable character of a boosted BMW six-cylinder over ultimate fuel efficiency. They understand the trade-off and embrace it.

City and highway performance

The EPA estimates the M240i Convertible at 21 MPG in the city and 30 MPG on the highway. The city figure, while not stellar, is typical for a performance car with a powerful engine. Stop-and-go traffic and frequent acceleration take their toll. However, the 30 MPG highway rating shows some of the engine’s efficiency potential. On longer drives, with consistent throttle input, the M240i can deliver reasonable fuel economy, making those weekend getaways more justifiable. The eight-speed automatic transmission (S8) prioritizes rapid shifts and performance, and it also helps to keep the engine in its most efficient rev range when cruising.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2021 BMW M240i Convertible at $2,400. 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. Remember that this is just an estimate, and your actual fuel costs will vary depending on your driving habits, the type of fuel you use, and local fuel prices. Someone who frequently uses premium fuel and drives aggressively will likely see a higher annual fuel cost, while someone who primarily drives conservatively on the highway may see a lower one. You can compare M240I MPG across all years.

Real-world expectations

While the EPA estimates provide a baseline, real-world fuel economy can vary. Owners of the M240i Convertible often report figures slightly below the EPA estimates, particularly in mixed driving. Expect numbers closer to the low 20s in daily commuting with some spirited driving. Highway trips, driven with a light foot, might approach 30 MPG, but aggressive acceleration or higher speeds will quickly bring that number down. Turbochargers are sensitive to driving style, and frequent hard acceleration will always negatively impact fuel economy. Be mindful of your driving habits and adjust to maximize efficiency when desired.

How it compares

Compared to its rivals, the M240i Convertible’s fuel economy is competitive. The Audi S3, with its 2.0L turbocharged four-cylinder, achieves around 23 MPG combined. The Porsche 718 Boxster hovers around 22 MPG combined with its base engine. The Mercedes-AMG CLA 35 delivers around 25 MPG combined. While some rivals might offer slightly better fuel economy, they often lack the smoothness and sound of the M240i’s inline-six. The BMW offers a balance of performance and acceptable fuel consumption that appeals to drivers who want engagement and practicality. Don’t forget you can also check all Bmw fuel economy data.

Tips to maximize efficiency

The M240i Convertible’s driving mode selector is useful. Using the “Comfort” or “Eco Pro” modes will soften throttle response and encourage earlier upshifts, promoting better fuel economy in everyday driving. Avoid constantly tapping into the engine’s full potential; save the power for special occasions.

Tire pressure is important for fuel efficiency. Make sure your tires are properly inflated to the manufacturer’s recommended pressure, found on the driver’s side doorjamb. Underinflated tires create more rolling resistance, forcing the engine to work harder and consume more fuel. Check and adjust your tire pressure regularly, especially with temperature changes.

Minimize unnecessary weight. Carrying extra cargo in the trunk adds to the vehicle’s overall weight and reduces fuel efficiency. Remove any items you don’t need to lighten the load and improve your MPG. This is relevant for a convertible, where trunk space is limited.

Anticipate traffic flow. By looking ahead, you can avoid unnecessary braking and acceleration. Smooth driving maximizes fuel economy, especially for turbocharged engines that are sensitive to rapid throttle changes.