24 MPG combined almost seems beside the point when you’re talking about the 2019 BMW M240i xDrive Convertible. This isn’t a sensible appliance; it’s a weekend escape machine designed to deliver thrills first and foremost. Fuel economy is a factor, certainly, but it’s a distant consideration for those drawn to the draw of a turbocharged inline-six and open-top motoring.

City and highway performance

The EPA estimates this M240i variant will achieve 21 MPG in the city and 30 MPG on the highway. Those figures are a direct consequence of the car’s character. The city MPG reflects the stop-and-go conditions where the eager engine and responsive eight-speed automatic transmission are constantly being called upon. Highway MPG benefits from the engine settling into a more relaxed cruise. The BMW’s engineering allows it to offer both a genuinely engaging driving experience and still deliver respectable fuel economy at higher speeds.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2019 BMW M240i xDrive Convertible to be $2,400. This figure is based on driving 15,000 miles per year, with a mix of city and highway driving, and using national average fuel prices. Your actual costs could vary depending on your driving habits, the type of fuel you use, and, of course, fluctuations in fuel prices themselves. It provides a useful benchmark for comparing running costs with other performance vehicles. The typical M240i buyer is less concerned about shaving pennies off each gallon and more appreciative of the performance that results from using premium gasoline.

Real-world expectations

While EPA estimates offer a standardized yardstick, real-world MPG for the M240i xDrive Convertible will likely vary. If you spend most of your time in heavy traffic or enjoy pushing the engine to its limits on winding roads, expect your fuel economy to be lower than the official figures. Conversely, careful highway driving could see you exceed the 30 MPG estimate. The key is understanding how your own driving style impacts fuel consumption.

How it compares

The M240i xDrive Convertible occupies a unique space. A natural competitor, the Audi S3 Sedan (25 MPG combined), delivers similar performance with a more practical roofline, while the Porsche 718 Boxster (24 MPG combined) offers a purer sports car experience at a higher price point with less emphasis on everyday usability. All Bmw fuel economy data is available online, and it’s worth considering the 230i Convertible (28 MPG combined) if fuel efficiency is a higher priority. Even within the BMW family, the four-cylinder 430i Convertible (28 MPG combined) provides a more frugal, yet still stylish, alternative. The M240I MPG across all years shows minimal fluctuations, pointing to a stable powertrain design. This reinforces the idea that buyers choose this car for its specific blend of performance and relative practicality, not necessarily for segment-leading efficiency.

Tips to maximize efficiency

Use “Comfort” mode when cruising. The M240i’s driving mode selector significantly alters the car’s responsiveness. Comfort mode softens throttle response and optimizes transmission shift points for fuel efficiency without sacrificing too much performance. Sport and Sport+ modes are exhilarating, but they will noticeably decrease MPG.

Pay attention to tire pressure. Properly inflated tires reduce rolling resistance, improving fuel economy. Check your tire pressure regularly and ensure it matches the recommended levels on the doorjamb sticker.

Avoid aggressive acceleration and braking. Smooth, progressive inputs not only enhance ride comfort but also reduce fuel consumption. Anticipate traffic flow and maintain a consistent speed whenever possible.

Reduce unnecessary weight. Carrying extra weight in the trunk or back seat requires the engine to work harder, decreasing fuel economy. Remove any unnecessary items from your car when possible.

Consider using cruise control on the highway. Cruise control helps maintain a constant speed, preventing sudden accelerations that waste fuel. This is especially effective on relatively flat roads.