25 MPG combined. That’s what you can expect from the 2017 BMW M240i Convertible with its 3.0L inline-six and eight-speed automatic. A number that few M240i convertible buyers worry much about. This isn’t a Prius, nor is it trying to be. It’s a compact, rear-wheel-drive (or optional xDrive) convertible designed to deliver thrills, accepting the fuel consumption as part of the experience. The M240i convertible buyer prioritizes open-air experiences, the unmistakable BMW inline-six growl, and sharp handling.

City and highway fuel economy

The EPA figures for the M240i Convertible break down to 21 MPG in the city and 32 MPG on the highway. The city number reflects the engine’s eagerness to rev and the temptation to use the readily available power at every green light. Around town, stop-and-go traffic inevitably takes its toll. The highway figure of 32 MPG is more reasonable, showing that the car can achieve decent economy when cruising at a steady speed. However, even on the highway, the car’s performance encourages quick bursts of acceleration to pass slower traffic, impacting the overall average.

Annual fuel cost

The EPA estimates an annual fuel cost of $2,300 for the 2017 BMW M240i Convertible. This figure is based on driving 15,000 miles per year, split roughly 55% city and 45% highway, and using national average fuel prices. Remember that premium fuel is required for optimal performance, so you can’t save money by filling up with regular. This cost is significant and is something that buyers should factor into their ownership budget, especially when considering insurance, maintenance, and other expenses.

Real-world expectations

The EPA estimates provide a baseline, but real-world fuel economy can vary depending on driving style, traffic conditions, and even the type of roads driven. Someone who frequently enjoys spirited backroad drives, or who spends most of their time in congested urban areas, will likely see numbers below the EPA estimates. Someone who primarily uses the car for long highway commutes may achieve slightly better results.

The M240i Convertible rewards a smooth and measured driving style with improved fuel efficiency, but its performance makes restraint a constant challenge. Before buying, be sure to check M240I MPG across all years to see if other model years suit your needs better.

How it compares

In the world of compact performance convertibles, the M240i’s fuel economy is competitive, but not class-leading. A 2017 Audi S3 Cabriolet, with its 2.0L turbocharged four-cylinder engine and all-wheel drive, achieves a slightly better 28 MPG combined. However, it lacks the inline-six smoothness of the BMW. A Porsche 718 Boxster, while offering superior handling and a more exotic image, delivers similar fuel economy, around 24 MPG combined, despite its mid-engine layout. The Mercedes-Benz C300 Cabriolet, with its more comfort-oriented approach, manages around 25 MPG combined, similar to the M240i. These comparisons highlight the trade-off between performance, driving experience, and fuel efficiency that defines this segment. If you wish to examine all Bmw fuel economy data, we have it here.

Tips to maximize fuel efficiency

The M240i Convertible’s fuel economy is highly influenced by driving habits. Avoid aggressive acceleration and hard braking. Smooth, deliberate inputs will reduce unnecessary fuel consumption and keep the turbocharger from constantly spooling up. Use the ECO PRO mode when possible.

The ECO PRO mode changes the throttle response and transmission’s shift points to prioritize fuel efficiency over performance. While it may dull the driving experience somewhat, it can make a noticeable difference in fuel consumption on longer trips.

Ensure proper tire inflation. Underinflated tires increase rolling resistance, which negatively impacts fuel economy. Check and adjust your tire pressure regularly, following the recommendations on the door jamb sticker. Lightweight aftermarket wheels will decrease rotational mass, which can also improve MPG. Be sure to buy wheels that are as light or lighter than the factory wheels and confirm that they are a fitment for the M240i.

Minimize aerodynamic drag. Remove any unnecessary items from the car that could create drag, such as roof racks or aftermarket wings. While the M240i Convertible is not particularly sensitive to aerodynamic drag, these small changes can contribute to a slight improvement in fuel efficiency. On cooler days, avoid using the air conditioner unnecessarily. The AC compressor puts a significant load on the engine, which reduces fuel economy. Instead, rely on the convertible top for the ventilation.

Service the engine regularly. A well-maintained engine operates more efficiently. Follow the manufacturer’s recommended maintenance schedule, including oil changes, air filter replacements, and spark plug replacements. A healthy engine burns fuel more completely, reducing emissions and maximizing fuel economy. A properly tuned engine will almost always be more efficient.