The 2020 BMW M240i Convertible, with its strong 3.0L inline-six engine, gets 25 MPG combined, so it’s not a fuel-sipping hybrid. However, this number is fine for drivers who want open-top thrills and quick performance over fewer trips to gas stations. This isn’t the choice for hypermilers; it’s for those who love a boosted BMW engine’s sound and the wind in their hair.

City and highway performance

The EPA estimates are 22 MPG in the city and 30 MPG on the highway. These figures describe a car that can be driven conservatively but isn’t really designed for stop-and-go traffic. The city estimate shows the constant need to accelerate and decelerate, which engages the turbocharger often. The highway figure, however, shows that the M240i Convertible cruises more efficiently when the engine isn’t working so hard. The eight-speed automatic transmission (S8) helps here, keeping the engine in its sweet spot at higher speeds. Anyone buying this car will occasionally accelerate quickly on the open road, so the highway MPG will reflect that.

Annual fuel cost

The EPA calculates the annual fuel cost for the 2020 BMW M240i Convertible at $2,300. This is based on driving 15,000 miles per year and using national average fuel prices. Your actual fuel cost will vary depending on your driving habits, the price of fuel in your area, and the type of fuel you use. This number works as a baseline for comparing fuel expenses with other vehicles.

Real-world expectations

While the EPA numbers are a useful benchmark, real-world MPG will vary. If you spend most of your time in urban environments and often enjoy the M240i’s fast acceleration, expect fuel economy closer to the city estimate, maybe even a little below it. If you mainly use the car for long highway journeys and drive gently, you might reach or exceed the highway estimate. The M240i Convertible drives best with a light foot, but it also tempts you to use its power.

How it compares

Compared to other sporty convertibles, the M240i’s fuel economy is in the middle. A Mazda MX-5 Miata, known for its fuel efficiency, gets around 30 MPG combined and works for those who want to save gas. The Audi S5 Cabriolet, with a more powerful V6, uses about the same amount of fuel as the M240i at around 24 MPG combined and works for those needing more space. If you review all Bmw fuel economy data, you will notice the M240i makes very few compromises between performance and fuel economy. Those considering the M240i appreciate its blend of performance, luxury, and efficiency, making the slight difference in MPG small compared to their priorities. You can also review M240I MPG across all years.

Tips to maximize efficiency

The biggest thing that affects fuel economy in the M240i is how you drive. Avoiding quick acceleration and hard braking can help.

Keep your tires inflated to the right pressure. Low tires increase rolling resistance, which hurts fuel economy. Check your tire pressure often, especially when the temperature changes.

Regular maintenance is important for engine performance and fuel efficiency. Get regular oil changes, air filter replacements, and vehicle inspections as BMW recommends.

Avoid modifying the engine or exhaust system to get more power. Aftermarket changes can hurt fuel economy.

Use BMW’s Eco Pro driving mode when you can. This mode changes the engine and transmission for fuel efficiency, reducing performance for better MPG. It’s useful for commuting or long highway drives when fuel economy is most important.