17 MPG combined. Frankly, fuel efficiency isn’t top of mind for anyone eyeing a 2020 BMW M8 Convertible. This machine is engineered for thrilling performance and head-turning looks. The fuel gauge is just another metric to monitor while enjoying its ferocious acceleration. Buyers are purchasing an experience, a statement, and the ability to unleash over 600 horsepower at will, and the fuel bill is simply part of owning it.

City and highway performance

The 2020 M8 Convertible’s EPA ratings reflect its high-performance nature. The city MPG figure of 15 MPG results from stop-and-go driving, which constantly requires the powerful V8 to accelerate the heavy vehicle. Out on the open road, the M8 fares slightly better, achieving 21 MPG on the highway. This improvement is due to the engine maintaining a more consistent speed, minimizing the need for aggressive acceleration. Even on the highway, expect that number to drop the moment you tap into the M8’s power for passing or the joy of experiencing its speed.

Annual fuel cost

The EPA estimates that the annual fuel cost for the 2020 BMW M8 Convertible is $3,400. This figure is based on driving 15,000 miles per year, with a mix of city and highway driving, and using the national average fuel prices at the time the EPA testing was conducted. This number provides a benchmark, but your actual costs could be higher depending on your driving habits, the type of fuel you use, and fluctuations in fuel prices. Those with a heavy foot, a common trait among M8 owners, should prepare to spend more at the pump.

Real-world expectations

It may be tough to hit the EPA numbers in everyday driving. The M8’s intoxicating power and engine note tempt you to accelerate, which reduces fuel economy. In real-world conditions, many M8 owners report averaging closer to 12-14 MPG in mixed driving. If you frequently engage the M8’s Sport or Sport+ driving modes, or frequently use the launch control feature, expect even lower numbers. Consider this a premium on the driving experience.

How it compares

The M8 Convertible isn’t the only performance convertible on the market, but its fuel economy is generally in line with its competitors. The Mercedes-AMG SL 63, for instance, achieves a similar 16 MPG combined. Move up to something like an Aston Martin DBS Superleggera Volante and expect figures closer to 14 MPG. Even the Porsche 911 Turbo S Cabriolet, known for its surprising usability, only manages around 17 MPG combined. If fuel costs truly matter to you, perhaps consider a different segment altogether. But for those who prioritize performance above all else, the M8’s efficiency is typical. Drivers interested in seeing all Bmw fuel economy data can compare across the manufacturer’s entire line. Also be sure to do your research on M8 MPG across all years.

Tips to maximize efficiency

While saving gas may not be a top priority for M8 Convertible owners, there are steps you can take to stretch each gallon of premium fuel a bit further. First, minimize aggressive acceleration and hard braking. The M8’s reliable engine delivers performance even with gentle throttle inputs, so try to anticipate traffic and maintain a smooth speed.

Next, use the M8’s Eco Pro driving mode when possible. This mode adjusts the engine and transmission settings to prioritize less gas, reducing throttle response and shifting to higher gears earlier. It won’t turn the M8 into a Prius, but it can help squeeze out a few extra MPGs during commutes.

Ensure that your tires are properly inflated. Underinflated tires increase rolling resistance, which reduces fuel economy. Check your tire pressure regularly and inflate them to the recommended level, which can be found on the sticker inside the driver’s side doorjamb.

Finally, consider the impact of optional equipment. Larger wheels and tires, for example, can increase rolling resistance and negatively affect fuel economy. If fuel efficiency is a concern, stick with the standard wheel and tire package.